The response tends to lean towards a response of "just google what you're looking for" - this is especially the prevalent answer, when asked for the best books to help understand Maya. Maya gets updated every year, so it makes sense to steer away from buying specific books to help with why-won't-keyframes-move-in-the-graph-editor questions.
There are LOADS of great books out there, that become like bibles for animators. Everything from Disney sketchbooks, to the ultimate Animator's Survival Kit, by Richard Williams. So...I made a page especially for them. Take a peek and let me know what you think: Books and Gifts for Animators