Animation is the process of making the illusion of motion and the illusion of change by means of the rapid display of a sequence of images that minimally differ from each other.
You can refer book for Animator.
Book Name-Computer Graphics, Multimedia and Animation
Author Name-by Pakhira & Malay K
Link : http://www.amazon.in/Computer-Graphics-Multimedia-Animation-Pakhira/dp/8120341279