The following is a small sampling of books from my own library that I like to recommend to my students. This list is by no means exhaustive, nor is every book perfect. Information can go out of date (and fashion). My suggestion is to try a little of everything and see what resonates with you.
Books on the History and Folklore
of Witchcraft
Aradia, or the Gospel of the Witches by Charles G. Leland
Doreen Valiente: Witch by Philip Heselton
Drawing Down the Moon by Margot Adler
The Element Encyclopedia of Witchcraft by Judika Illes
The Rebirth of Witchcraft by Doreen Valiente
The Night Battles by Carlo Ginzburg
The Triumph of the Moon by Ronald Hutton
Books About Modern Witchcraft,
Spells, Tools, and Magick
The Black Toad by Gemma Gary
Italian Folk Magic: Rue’s Kitchen Witchery by Mary-Grace Fahrun
The Element Encyclopedia of 5,000 Spells by Judika Illes
Keepers of the Flame by Morganna Davies and Aradia Lynch
Natural Magic by Doreen Valiente
Sigil Witchery: A Witch’s Guide to Crafting Magick Symbols by Laura Tempest Zakroff
Under the Witching Tree by Corinne Boyer
The Witch’s Altar by Jason Mankey and Laura Tempest Zakroff
The Witches’ Almanac (a yearly publication)
The Witch’s Book of Shadows by Jason Mankey
The Witch’s Cauldron by Laura Tempest Zakroff
Witchcraft for Tomorrow by Doreen Valiente
Books on Gods and Spirits
Goddesses in World Mythology by Martha Ann and Dorothy Myers Imel
The Return of the Dead by Claude Lecouteux
The Tradition of Household Spirits by Claude Lecouteux
The Witch’s Book of Spirits by Devin Hunter
The Witches’ God by Janet Farrar and Stewart Farrar
The Witches’ Goddess by Janet Farrar and Stewart Farrar
Inspirational Reading Starters
from the Fiction Aisle
American Gods by Neil Gaiman
Griffin and Sabine by Nick Bantock
Jitterbug Perfume by Tom Robbins
Juniper by Monica Furlong
Moonheart by Charles de Lint
You can also visit my blog A Modern Traditional Witch at Patheos (http://www.patheos.com/blogs/tempest), which is where I post regularly. If you’re reading this far off in the future, as long as the internet is still a thing, my blog is probably available in archive format for you to read.