While returning the book
Don't be in hurry at the library. Take sufficient time with you and let the librarian to take his/hers.
Don't quarrel with any staff for a book.
It will be better, if you take a list of the books that you want, with you.
If there are many people at the counter, please wit for your turn.
Try to return the book(s) in time.
Take care of book(s) in while you take them to home.
Keep away the books from the reach of the children.