collisions of objects how to prevent? ex. on few gameobj - books need help

Hey

I need to know how i can write correctly useing of the function Collider.OnCollisionEnter. I need this to use in my project, where i will have some (gameobj)books with box colider. How can i use this with my copy of books?
Im cloning one of books, and need to move new game obj to right in some position.

bump? very needed information