Leveling Books Websites

Audio Books
 Six quality websites to access kid's free audio books and audio stories
Portland Public Schools Leveled Books Lists
An online database of leveled books that you can search by title, author, RR level, or grade level

Scholastic Leveling Guide
Explains the TRIO system for leveling books

"Text Leveling and Little Books in First Grade"
A detailed article on the methods and results of leveling books for first grade readers