In the 1ed Dungeon Masters Guide Gary Gygax included a section on books that inspired his game. Once again I have hopped on the band wagon. So here is my Appendix N.
Asprin, Robert Lynn and various authors - Sanctuary Novels
Beagle, Peter - The Last Unicorn, Giant Bones
Chaucer, Geoffrey - The Canterbury Tales
Eddings, David - The Belgariad
Goldman, William - The Princess Bride
Goodkind, Terry - Wizard's First Rule
Grimm, Brothers - Fairy Tales
Howard, R. E. - Conan series.
Leiber, Fritz. - Fafhrd & Grey Mouser Series; et al
Le Guin, Ursula K. - Tales from Earthsea
Lovecraft, H.P. - Complete Works
McKiernan, Dennis L. - Tales of Mithgar
Salvatore, R.A. - The Dark Elf Trilogy
Tolkien, J. R. R. - The Hobbit
quick Vyzor update - The dotted line represents the unknown depth the last expedition descended via elevator.