While the list given here by no means represents everything I have read, it offers guidance to anybody keen to pursue any of the multiple strands in the story.
I would especially recommend anybody interested in Ada to seek out on YouTube The Ada Project by Conrad Shawcross, RA, which uses a hacked assembly line industrial robot to evoke the questing spirit of a remarkable young woman.
Books and articles relating to Annabella Milbanke, Lady Noel Byron
Beecher Stowe, Harriet, ‘The True Story of Lady Byron’s Life’ in Macmillan’s Magazine (UK) and Atlantic Monthly (US), September, 1869.
—Lady Byron Vindicated (London, Sampson Low & Son, 1870).
Blessington, Marguerite, Countess of, Conversations of Lord Byron (London, H. Colburn, 1834).
Crane, David, The Kindness of Sisters: Annabella Milbanke and the Destruction of the Byrons (London, HarperCollins, 2012).
Elwin, Malcolm, Lord Byron’s Wife (London, Macdonald, 1962).
—The Noels and the Milbankes (London, Macdonald, 1962).
—Lord Byron’s Family (London, John Murray, 1975). Completed by a second hand.
Fox, John, The Vindication of Lady Byron (London, R. Bentley, 1871). Largely comprising a series of essays published in Temple Bar, with added text.
Fox, Sir John, Byron, A Mystery (London, Grant Richards, 1924). Written by the approving son of the above author, with assistance from Mary, Countess of Lovelace.
Graham, T. Austin, ‘The Slaveries of Sex, Race and Mind: Harriet Beecher Stowe’s “Lady Byron Vindicated” ’, New Literary History, vol. 41, no. 1 (Winter 2010), pp. 173–90.
Gross, J. D., Byron’s ‘Corbeau Blanc’: The Life and Letters of Lady Melbourne (Texas, Rice University Press, 1997).
Guiccioli, Teresa, Marquis de Boissy, Témoins, translated as My Recollections of Lord Byron (London, R. Bentley, 1869). Worth seeking out for the influential and damaging chapter devoted to Byron’s marriage.
Lovelace, Ralph, Lady Noel Byron and the Leighs (private circulation, 1887).
—Astarte: A fragment of truth concerning George Gordon Byron, Sixth Lord Byron, recorded by his grandson (London, Christophers, 1905, 1921).
Markus, Julia, Lady Byron and Her Daughters (New York, W. W. Norton, 2015).
Mayne, Ethel Colburn, The Life and Letters of Anne Isabella, Lady Noel Byron (London, Charles Scribner, 1929).
Murray, John and Rowland Prothero, Lord Byron and His Detractors (London, private circulation, 1906).
Pierson, Joan, The Real Lady Byron (London, Robert Hale, 1992). Includes a useful section about the Noel family.
Taylor, Brian W., ‘Annabella, Lady Noel-Byron: A Study of Lady Byron on Education’, History of Education Quarterly vol. 38, no. 4 (1998), pp. 430–55.
Books, music, articles and online material relating to Ada Byron, Countess of Lovelace
Babbage, Charles and Ada Lovelace, Sketch of the Analytical Machine Invented by Charles Babbage with notes by the translator, extracted from Scientific Memoirs (London, R. and J. E. Taylor, 1843).
Brailsford, David, Babbage’s Analytical Engine, YouTube, https://youtu.be/5rtKoKFGFSM. All of Professor Brailsford’s online lectures about Babbage are invaluably lucid and lively.
Essinger, James, A Female Genius: How Ada Lovelace Lord Byron’s Daughter Started the Computer Age (London, Gibson Square, 2014).
Ferry, Georgina, ‘Ada Lovelace: In search of a “calculus of the nervous system” ’, The Lancet, vol. 386 (2015).
Hammerman, Robin and Andrew L. Russell, Ada’s Legacy (Vermont, Morgan & Claypool, 2015).
Howard, Emily, The Lovelace Trilogy, opera (2011).
Lethbridge, Lucy, Ada Lovelace: Computer Wizard Of Victorian England (London, Short Books, 2001). For younger readers, not wholly accurate but a great place to start, together with Sydney Padua.
MacFarlane, Alistair, ‘Alistair MacFarlane on the first-ever programmer: Ada Lovelace’, Philosophy Now, issue 96 (2013).
Martin, Ursula has headed and written some of the most insightful recent explorations of Ada Lovelace’s work as a mathematician. Some can be found online at: http://www.tandfonline.com/doi/full/10.1080/17498430.2017.1325297
Moore, Doris Langley, Ada, Countess of Lovelace, Byron’s Legitimate Daughter (London, John Murray, 1977).
Padua, Sydney, The Thrilling Adventures of Lovelace and Babbage (London, Particular Books, 2015).
Spufford, Francis and Jenny Uglow (eds), Cultural Babbage: Technology, Time and Invention (London, Faber & Faber, 1996).
Stein, Dorothy, Ada: A Life and Legacy (New York, MIT Press, 1985).
Swade, Doron, The Cogwheel Brain: Charles Babbage and the Quest to Build the First Computer (London, Little, Brown, 2000). Doron Swade masterminded the Science Museum model of Babbage’s calculating engine, comprising 8,000 parts, completed in 2002.
Toole, Betty A., Ada, the Enchantress of Numbers: A Selection from the Letters of Lord Byron’s Daughter and Her Description of the First Computer (California, Strawberry Press, 1992).
Whitbourn, James, ‘Ada’, for soprano, alto, tenor, bass choir and piano (Chester, Chester Music, 2015). Commissioned to mark the 200th anniversary of the birth of Ada Lovelace; words by Lord Byron.
Wolfram, Stephen, Idea Makers: Personal Perspectives on the Lives & Ideas of Some Notable People (Illinois, Wolfram Media, 2016).
Woolley, Benjamin, The Bride of Science: Romance, Reason and Byron’s Daughter (London, Pan Macmillan, 2015).
Lord Byron
Austin, Alfred, A Vindication of Lord Byron (London, Chapman & Hall, 1869).
Edgcumbe, Richard, Byron: The Last Phase (London, John Murray, 1909; Hamburg, Severus, 2012).
Eisler, Benita, Byron (London, Hamish Hamilton, 1999).
Grosskurth, Phyllis, Byron: The Flawed Angel (Massachusetts, Houghton Mifflin, 1997).
Jeaffreson, John Cordy, The Real Lord Byron (London, Hurst & Blackett, 1883).
MacCarthy, Fiona, Byron, Life and Legend (London, John Murray, 2002).
Marchand, Leslie, Byron: A Portrait 3 vols (London, John Murray, 1957).
—Byron’s Letters & Journals, 13 vols (John Murray, 1973–94). Moore, Thomas, Life and Letters of Lord Byron, 2 vols (London, John Murray, 1830; 1831; 1873). The 1831 edition contains Lady Byron’s ‘Remarks’.
Prothero, Rowland (ed.), The Works of Byron: Letters and Journals, 6 vols (London, John Murray, 1898–1902). This contains a great deal of useful additional information not published by Marchand.
Walker, Violet, The House of Byron (Shrewsbury, Quiller Press, 1988). Only for those who are interested in Byron’s antecedents (the family tree is the most extensive I have seen) and would like to know more about Ada’s paternal lineage.
Other useful books to consult
Bakewell, Michael and Melissa, Augusta Leigh: Byron’s Half-sister, A Biography (London, Chatto & Windus, 2000).
David, Deirdre, Intellectual Women and Victorian Patriarchy (New York, Cornell University Press, 1987).
Fox, Celina (ed.) London: World City 1800–1840 (London, Yale University Press, 1992).
Gunn, Peter, My Dearest Augusta (London, Bodley Head, 1968).
Hobhouse, John Cam, Baron Broughton, Recollections of a Long Life (London, John Murray, 1910).
Holmes, Richard, The Age of Wonder: How the Romantic Generation Discovered the Beauty and Terror of Science (London, HarperPress, 2009).
Origo, Iris, The Last Attachment (London, John Murray, 1949).
Secord, James A., Victorian Sensation: The Extraordinary Publication, Reception, and Secret Authorship of Vestiges of the Natural History of Creation (London, Chicago University Press, 2000).
Trevanion, Henry The Influence of Apathy (unknown publisher, London, 1827).
Winstone, H. V., Lady Anne Blunt: A Biography (Gloucester, Barzan, 2003).