In addition to the seven Chronicles of Narnia, I consulted quite a few other books in researching The Magician's Book. Here is a partial bibliography.
Barfield, Owen. 1984. Poetic Diction: A Study in Meaning. Wesleyan.
Bettelheim, Bruno. 1989. The Uses of Enchantment: The Meaning and Importance of Fairy Tales. Vintage.
Bramlett, Perry C., and Ronald W. Higdon. 1998. Touring C.S. Lewis' Ireland & England. Smyth & Helwys Publishing.
Carpenter, Humphrey. 2006. The Inklings: C.S. Lewis, J.R.R. Tolkien and Their Friends. HarperCollins.
Carpenter, Humphrey, and J.R.R. Tolkien. 2000. J.R.R. Tolkien: A Biography. Houghton Mifflin.
Curry, Patrick. 2004. Defending Middle-Earth: Tolkien: Myth and Modernity. Houghton Mifflin.
Downing, David C. 2005. Into the Wardrobe: C. S. Lewis and the Narnia Chronicles. Jossey-Bass.
Duriez, Colin. 2005. The C.S. Lewis Chronicles: The Indispensable Biography of the Creator of Narnia Full of Little-Known Facts, Events and Miscellany. Bluebridge.
Lewis, ed W.H. 1966. Letters of C.S. Lewis. Geoffrey Bles Ltd.
Ford, Paul F. 2005. Companion to Narnia, Revised Edition: A Complete Guide to the Magical World of C.S. Lewis's The Chronicles of Narnia. HarperSanFrancisco.
Frye, Northrop. 2000. Anatomy of Criticism: Four Essays. Princeton University Press.
Garth, John. 2005. Tolkien and the Great War: The Threshold of Middle-earth. Houghton Mifflin.
Goldthwaite, John. 1996. The Natural History of Make-Believe : A Guide to the Principal Works of Britain, Europe, and America. Oxford University Press, USA.
Green, Roger Lancelyn, and Walter Hooper. 1994. C. S. Lewis: A Biography, Revised Edition. Harvest Books.
Greene, Graham. 1981. The Collected Essays of Graham Greene. Penguin (Non-Classics).
Hooper, Walter. 1996. C. S. Lewis: A Companion & Guide. Harper San Francisco.
Hutton, Ronald. 1993. The Pagan Religions of the Ancient British Isles: Their Nature and Legacy. Wiley-Blackwell.
Hutton, Ronald. 2003. Witches, Druids and King Arthur. Hambledon & London.
Jacobs, Alan. 2005. The Narnian: The Life and Imagination of C. S. Lewis. HarperSanFrancisco.
Lewis, C. S. 1936. Allegory of Love. Oxford University Press.
Lewis, C. S. 2004. The Collected Letters of C.S. Lewis, Volume 1: Family Letters, 1905-1931. HarperOne.
Lewis, C. S. 2004. The Collected Letters of C.S. Lewis, Volume 2. HarperOne.
Lewis, C. S. 2007. The Collected Letters of C.S. Lewis, Volume 3: Narnia, Cambridge, and Joy, 1950 - 1963. HarperOne.
Lewis, C. S. 1994. The Discarded Image : An Introduction to Medieval and Renaissance Literature (Canto). Cambridge University Press.
Lewis, C. S. 1992. An Experiment in Criticism (Canto). Cambridge University Press.
Lewis, C.S. 1992. All My Road Before Me: The Diary of C. S. Lewis, 1922-1927. Harvest Books.
Lewis, C.S. 1966. Essays Presented to Charles Williams. Wm. B. Eerdmans Publishing Co..
Lewis, C.S. 2002. On Stories: And Other Essays on Literature. Harvest Books.
Lewis, C.S. 1961. A Preface to Paradise Lost: Being the Ballard Matthews Lectures Delivered at University College, North Wales, 1941. Oxford University Press, USA.
Lewis, C.S. 1966. Surprised by Joy: The Shape of My Early Life. Harvest Books.
Lurie, Alison. 2002. Boys and Girls Forever: Children's Classics from Cinderella to Harry Potter. Penguin (Non-Classics).
MacDonald, George. 1964. Phantastes, and Lilith. W. B. Eerdmans Pub. Co.
Rackham, Arthur. 1979. Rackham's Color Illustrations for Wagner's "Ring". Dover Publications.
Sarrantonio, Al. 2004. Flights: Extreme Visions of Fantasy. Roc Hardcover.
Shippey, Tom. 2002. J.R.R. Tolkien: Author of the Century. Houghton Mifflin.
Shippey, Tom. 2003. The Road to Middle-earth: Revised and Expanded Edition. Houghton Mifflin.
Sisman, Adam. 2007. The Friendship: Wordsworth and Coleridge. Viking.
Spufford, Francis. 2002. The Child That Books Built: A Life in Reading. Metropolitan Books.
Sykes, Bryan. 2007. Saxons, Vikings, and Celts: The Genetic Roots of Britain and Ireland. W. W. Norton.
Tolkien, J. R. R., and Humphrey Carpenter. 2000. The Letters of J.R.R. Tolkien. Houghton Mifflin.
Wilson, A. N. 1990. C. S. Lewis: A Biography. Fawcett.