1. Carpenter, H. (1979). The Inklings: C. S. Lewis, J.R.R. Tolkien, Charles Williams, and Their Friends, Houghton Mifflin.
2. Glyer, D.P. (2007). The Company They Keep. C. S. Lewis and J. R. R. Tolkien as Writers in Community, Kent State University Press.
3. Duriez, C., and Porter, D. (2001). The Inklings Handbook: A Comprehensive Guide to the Lives, Thought, and Writings of C.S. Lewis, J.R.R. Tolkien, Charles Williams, Owen Barfield, and Their Friends, Chalice Press.
4. Lewis on Friendship;Isley;Inklings Forever,2008
5. Sammons, M.C. (2010). War of the Fantasy Worlds: C.S. Lewis and J.R.R. Tolkien on Art and Imagination, Praeger.