Children need books in their hands. Teachers work really hard to stock their library full of quality books. I have created a Book Borrowing Contract that I use at the culmination of our Book Etiquette mini-lessons. After the students and I talk about how to treat a book and they sign the contract, I have them take it home, talk with their parents, and then have the parents sign as well.
Hope this works for you too! Let me know if you have any questions or need any revisions to make it work for your classroom!