lets see, good gecko books... any specific kind of gecko? Rhacodactylus by Philippe de Vosjoli, Frank Fast and Allen Repashy- amazing book, but expensive 40$, another one for same price- The Herpetoculture of Leopard Geckos by Philippe de Vosjoli, Ron Tremper, and Roger Klingenberg. i would go for the one published in 2005, a lot of the books more than ten years old are really outdated. good luck!