Bianchi, U., and L. Jones, ed. “Twins: An Overview” in Encyclopedia of Religion. 2nd ed., vol. 14. Detroit: Macmillan Reference, 2005.
Bostock, John, and H. T. Riley, trans. The Natural History of Pliny. London: H. G. Bohn ,1855-1857.
Brewer, J. S., ed. Giraldi Cambrensis Opera, scilicet, Speculum Ecclesiae. Rolls Series, no. 21, vol. 4. London: Her Majesty’s Stationery Office, 1873.
Bromwich, Rachel, ed. and trans.Trioedd Ynys Prydein: The Welsh Triads. Cardiff: University of Wales Press, 2006.
Bromwich, Rachel, and D. Simon Evans, trans. Culhwch and Olwen: An Edition and Study of the Oldest Arthurian Tale. Cardiff: University of Wales Press, 1992.
Bugge, John. “Fertility Myth and Female Sovereignty in ‘The Weddynge of Sir Gawen and Dame Ragnell’” in The Chaucer Review, Vol. 39, No. 2, 2004.
Caesar. The Gallic War. Translated by Carolyn Hammond. Oxford, UK: Oxford University Press, 1996.
Cameron, M. L. Anglo-Saxon Medicine. Cambridge, UK: Cambridge University Press, 2006.
Cartwright, Jane. Feminine Sanctity and Spirituality in Medieval Wales. Cardiff: University of Wales Press, 2008.
Chadwick, Nora K. The Celts. Harmondsworth: Penguin, 1970.
Claudian. “Poem on Stilicho’s Courtship,” II. Translated by Maurice Platnauer. London: William Heinemann, 1922. Retrieved from: http://www.gutenberg.org/files/51444/51444-h/51444-h.htm#STILICHIO_II.
Cross, T. P., editor, and C. H. Slover, translator. The Boyhood Deeds of Finn mac Cumhaill. New York: Henry Holt & Co., 1936.
Davies, Sioned. The Four Branches of the Mabinogi. Llandysul, Wales, UK: Gomer Press, 1993.
Davies, Sioned, trans. The Mabinogion. New York: Oxford University Press, 2007.
De la Villemarqué, Viscount Théodore Hersart, trans. Popular Songs of Brittany: Barzaz-Breiz. Paris, 1846.
Eliade, Mircea. A History of Religious Ideas, Vol. 2: From Gautama Buddha to the Triumph of Christianity. Translated by Willard R. Trask. Chicago: University of Chicago Press, 1982.
Ellis, T. P. “Legal references, terms and conceptions in the Mabinogion” in Y Cymmrodor volume 39, 1928.
Ford, Patrick K. The Celtic Poets: Songs and Tales from Early Ireland and Wales. Belmont, MA: Ford and Bailie Publishers, 1999.
Ford, Patrick K., trans. The Mabinogi and Other Medieval Welsh Tales. Berkeley, CA: University of California Press, 1977.
Geoffrey of Monmouth. Historia regum Britannie (History of the Kings of Britain). Translated and updated by Aaron Thompson and J. A. Giles. (originally published 1136). London: [n.p.], 1848.
Gerald of Wales and John William Sutton, trans. “The Tomb of King Arthur” from The Camelot Project. 2001. d.lib.rochester.edu/camelot/text/gerald-of-wales-arthurs-tomb.
Green, Miranda. The Gods of the Celts. Phoenix Mill: Sutton Publishing Ltd., 2004.
———. “Vessels of Death: Sacred Cauldrons in Archaeology and Myth” at https://www.cambridge.org/core.
Green, Miranda, and Malcom Todd, ed. “Gallo-British Deities and Their Shrines” in A Companion to Roman Britain. Oxford, UK: Blackwell Publishing, 2004.
Gruffydd, W.J. Folklore and Myth in the Mabinogion. Cardiff: University of Wales Press, 1958.
———. Math vab Mathonwy: An Inquiry into the Origins and Development of the Fourth Branch of the Mabinogi, with the Text and a Translation. Cardiff: University of Wales Press, 1928.
———. Rhiannon: Inquiry into the First and Third Branches of the Mabinogion. Cardiff: University of Wales Press, 1953.
Guest, Lady Charlotte, trans. The Mabinogion. London: Bernard Quaritch, 1877.
Gwyndaf, Robin. Welsh Folk Tales. Cardiff: National Museums and Galleries of Wales, 1999.
Hahn, Thomas, ed. “The Wedding of Sir Gawen and Dame Ragnelle” in Sir Gawen: Eleven Romances and Tales. Kalamazoo, MI: Medieval Institute Publications, 1995. http://d.lib.rochester.edu/teams/text/hahn-sir-gawain-wedding-of-sir-gawain-and-dame-ragnelle.
Hamp, E. P. “Imbolc, óimelc” in Studia Celtica, 14, 106, 1979.
———. “Mabinogi and Archaism” in Celtica 23, 1999.
Haycock, Marged, ed. and trans. Legendary Poems from the Book of Taliesin. Aberystwyth, Wales, UK: CMCS, 2015.
Herodian of Antioch. History of the Roman Empire. Translated by Edward C. Echols. Berkeley and Los Angeles: University of California Press, 1961. Retrieved from: http://www.tertullian.org/fathers/herodian_03_book3.htm.
Jackson, Kenneth. The International Popular Tale in Early Welsh Tradition. Cardiff: University of Wales Press, 1961.
Jenkins, Dafydd, and Morfydd E. Owen, eds. The Welsh Law of Women: Studies Presented to Professor Daniel A. Binchy on His Eightieth Birthday. Cardiff: University of Wales Press, 1980.
Jones, Thomas Gwynn. Welsh Folklore and Folk-Custom (London: Methuen & Co., Ltd., 1930).
Keith, W. J. John Cowper Powys’s A Glastonbury Romance: A Reader’s Companion—Updated and Expanded Edition, 2010. http://www.powys-lannion.net/Powys/Keith/Gcompanion.pdf.
Koch, J. T. “Matronae” in Celtic Culture: A Historical Encyclopedia.
Lawrence, Elizabeth A. Hunting the Wren: Transformation of Bird to Symbol. Knoxville: University of Tennessee Press, 1997.
The Laws of Hywel Dda. The Cambro-Briton vol. 2, no. 21. May 1821.
Mac Cana, Proinsias. Celtic Mythology. London: Hamilin Publishing Group, 1970.
———. The Mabinogi. Cardiff: University of Wales Press, 1992.
MacKillop, J. “Efnysien” in A Dictionary of Celtic Mythology. London: Oxford University Press, 2004.
McKenna, C. “The Theme of Sovereignty in Pwyll” in C. W. Sullivan, ed., The Mabinogi: A Book of Essays. New York: Garland Publishing, 1996.
Markale, Jean. Women of the Celts. Rochester, VT: Inner Traditions, 1986.
Miles-Watson, Jonathan. Welsh Mythology: A Neo-Structuralist Approach. Amherst, NY: Cambria Press, 2009.
Nitze, William A. “The Sister’s Son and the Conte del Graal” in Modern Philology vol. 9, no. 3, 1912.
Northrup, Christine. Women’s Bodies, Women’s Wisdom: Creating Physical and Emotional Health and Healing. New York: Bantam, 2010.
Owen, Morfydd. Meddygon Myddfai: A Preliminary Survey of Some Medieval Medical Writing in Welsh, in Studia Celtica; 1975.
Parker, Will. The Four Branches of the Mabinogi. Oregon House, CA: Bardic Press, 2005.
“Phases of the Moon and Percent of the Moon Illuminated.” http://aa.usno.navy.mil/faq/docs/moon_phases.php.
Pliny the Elder. The Natural History. Translated by John Bostock and H. T. Riley. London: Henry G. Bohn, 1855. Retrieved from: http://data.perseus.org/citations/urn:cts:latinLit:phi0978.phi001.perseus-eng1:25.59.
Rees, Alwyn. “The Divine Hero in Celtic Hagiology,” in Folklore, vol. 47, no. 1, 1936.
Rees, Alwyn, and Brinley Rees. Celtic Heritage: Ancient Tradition in Ireland and Wales. London: Thames and Hudson, 1961
Reno, Frank D. The Historic King Arthur: Authenticating the Celtic Hero of Post-Roman Britain. Jefferson, NC: McFarland & Co Inc., 1997.
Ross, Anne. Folklore of Wales. Stroud, UK: Tempus Publishing, 2001.
———. Pagan Celtic Britain. Chicago: Academy Chicago Publishers, 1996.
Sessele, Erica J. “Exploring the Limitations of the Sovereignty Goddess through the Role of Rhiannon” in Proceedings of the Harvard Celtic Colloquium Vol. 14, 1994.
Sheehan, Sarah. “Matrilineal Subjects: Ambiguity, Bodies, and Metamorphosis in the Fourth Branch of the “Mabinogi,” in Signs, 34 (2), 2009.
Siewers, Alfred K. “Writing an Icon of the Land: the Mabinogi as a Mystagogy of Landscape” in Journal of the Medieval Academy of Ireland. Peritia 19, 2005.
Sikes, Wirt. British Goblins: Welsh Folk-lore, Fairy Mythology, Legends and Traditions. London: Willian Clowes and Sons, 1880.
Skene, William F. The Four Ancient Books of Wales. Edinburgh: Edmonston and Douglas, 1868. http://www.sacred-texts.com/neu/celt/fab/fab000.htm.
Solinus. Collectanea Rerum Memorabiliam. Translated by Arthur Golding. London: Thomas Hacket, 1587. Retrieved from: http://name.umdl.umich.edu/A12581.0001.001.
Telyndru, Jhenah. Avalon Within: A Sacred Journey of Myth, Mystery, and Inner Wisdom. Woodbury, MN: Llewellyn Publications, 2010.
———. Rhiannon: Divine Queen of the Celtic Britons. Alresford, Hampshire, UK: Moon Books, 2018.
Thomas, Gwyn. Dafydd ap Gwilym: His Poems. Cardiff: University of Wales Press, 2001.
Thompson, Stith. Motif-index of folk-literature: a classification of narrative elements in folktales, ballads, myths, fables, medieval romances, exempla, fabliaux, jest-books, and local legends. Bloomington, IN: Indiana University Press, 1955-1958. Via: www.ruthenia.ru/folklore/thompson/.
Valente, Roberta Louise. “Gwydion and Arianrhod: Crossing the Boarders of Gender in Math” in Bulletin of the Board of Celtic Studies 35, 1988.
———. “Merched Y Mabinogi: Women and the Thematic Structure of the Four Branches” (unpublished) PhD thesis, Cornell University, 1986.
Waddell, John. Archaeology and Celtic Myth. Dublin: Four Courts Press, 2014.
Warner, George F., ed. Giraldi Cambrensis Opera, Vol. VIII, De Principis Instructione Liber. Rolls Series, vol. 8, no. 21. London: Her Majesty’s Stationery Office, 1891.
Wentersdorf, Karl. “The Folkloric Symbolism of the Wren” in The Journal of American Folklore vol. 90, no. 358, 1977.
Winward, Fiona. “The Women in the Four Branches” in Cambrian Medieval Studies 34, 1997.
“The Wisdom of the Cymry” in The Cambro-Briton, Vol. 3, No. 26, 1822.
Herbalism
Allen, David E., and Gabrielle Hatfield. Medicinal Plants in Folk Tradition: An Ethnobotany of Britain and Ireland. Portland, OR:Timber Press, 2004.
Beith, Mary Healing Threads: Traditional Medicines of the Highlands and Islands. Edinburgh, UK: Polygon, 1995.
Beryl, Paul. The Master Book of Herbalism.Washington: Phoenix Publishing Co., 1984.
Coffey, Timothy. The History and Folklore of North American Wildflowers. New York: Houghton Mifflin Company, 1993.
Culpeper, Nicholas. Culpeper’s Complete Herbal. London: Richard Evans, 1816.
Cunningham, Scott. Cunningham’s Encyclopedia of Magical Herbs. St. Paul, MN: Llewellyn Publications, 1985.
Darwin, Tess. The Scots Herbal: The Plant Lore of Scotland. Edinburgh: Mercat Press, 1996.
Davies, Hugh, Welsh Botanology: A Systematic Catalogue of the Native Plants of the Isle of Anglesey in Latin, English and Welsh with the Habitats of the Rarer Species, and a Few Observations. London: W. Merchant, 1813.
Green, James. The Herbal Medicine-Maker’s Handbook: A Home Manual. Berkeley, CA: Crossing Press, 2000.
Grieve, Margaret. A Modern Herbal: The Medicinal, Culinary, Cosmetic and Economic Properties, Cultivation, and Folk-Lore of Herbs, Grasses, Fungi, Shrubs & Trees with Their Modern Scientific Uses. Mineola, NY: Dover Publications, 1971.
Hoffmann, David. Welsh Herbal Medicine. Aberteifi, Wales, UK: Abercastle Publications, 1978.
Hurry, Jamieson B. The Woad Plant and its Dye. London: Oxford University Press, 1930.
Landsberg, Sylvia. The Medieval Garden. Toronto: University of Toronto Press, 2003.
Lawton, Jocelyne. Flowers and Fables: A Welsh Herbal. Bridgend, Wales, UK: Seren Books, 2006.
Locke, Tony. Tales of the Irish Hedgerows. Dublin: The History Press, 2017.
MacCoitir, Niall. Ireland’s Wild Plants: Myths, Legends & Folklore. Cork, IE: The Collins Press, 2015.
Martin, Laura C. Wildflower Folklore. Charlotte, NC: East Woods Press, 1984.
McIntyre, Anne. Flower Power: Flower Remedies for Healing Body and Soul Through Herbalism, Homeopathy, Aromatherapy, and Flower Essences. New York: Henry Holt and Company, 1996.
Mercatante, Anthony S. The Magic Garden: The Myth and Folklore of Flowers, Plants, Trees and Herbs. New York: Harper & Row, 1976.
Paine, Angela. The Healing Power of Celtic Plants: Their History, Their Use, and the Scientific Evidence That They Work. Winchester, UK: O Books, 2006.
Rätsch, Christian, and Claudia Müller-Ebeling. The Encyclopedia of Aphrodisiacs: Psychoactive Substances for Use in Sexual Practices. Randolph, VT: Park Street Press, 2013.
Riddle, John M. Eve’s Herbs: A History of Contraception and Abortion in the West. Cambridge, MA: Harvard University Press, 1997.
Roth, H. “Vervain Herb from Alchemy Works” via Alchemy Works, 2012. http://www.alchemy-works.com/herb_vervain.html
Stuart, Malcom, ed. The Encyclopedia of Herbs and Herbalism. New York: Grosset & Dunlap, 1979.
Watts, D. C. Dictionary of Plant Lore. London, UK: Elsevier, 2007.
Williams, John, and John Pughe, trans. The Physicians of Myddvai; Meddygon Myddfai; or the medical practice of the celebrated Rhiwallon and his sons, of Myddvai, in Caermarthenshire, physicians to Rhys Gryg, Lord of Dynevor and Ystrad Towy, about the middle of the thirteenth century; From ancient Mss. in the libraries of Jesus College, Oxford, Llanover, and Tonn; with an English translation; and the legend of the Lady of Llyn y Van. Llandovery, Wales, UK: [n. p.], 1861.
“The Woad Plant and Its Dye: A Review” in Scottish Geographical Magazine, 47:5, 1931.
Wood, Matthew. The Earthwise Herbal: A Complete Guide to Old World Medicinal Plants. Berkeley, CA: North Atlantic Books, 2008.
Zech-Matterne, Veronique, and Luc Leconte. “New archaeobotanical finds of Isatis tinctoria L. (woad) from iron age gaul and a discussion of the importance of woad in ancient time” in Vegetation History and Archaeobotany. 19 (2), 2010.