The Mahalo Top 7
- Official Site: The Encyclopedia of Immaturity
- USA Today: Klutz CEO Wrote the Book on Immaturity (October 2007)
- Dr. Blank: In Praise of Immaturity (January 19, 2008)
- Cookie: Daily Find: How-To Hilarity (October 18, 2007)
- Great Gift Ideas: Encyclopedia of Immaturity (August 6, 2008)
- Amazon.com: Encyclopedia of Immaturity
- YouTube Video: The Broom & Egg Whap! (Time: 1:40)
The Encyclopedia of Immaturity News and Reviews
- PlaythingsCool Compendiums: Cool Compendiums (January 1, 2008)
- WSJ.com: Beyond Fairy Tales (December 8, 2007)
- Chicago Sun Times: The Art of Doughnut Bouncing (October 25, 2007)
- Google News: The Encyclopedia of Immaturity Search
The Encyclopedia of Immaturity Reviews and Criticism
- Parentihood.com: Book Reviews: Tales of Tricks and Treats
- The New York Times: Never Grow Up (January 13, 2008)
- Publishers Weekly: Children's Notes (October 29, 2007)
The Encyclopedia of Immaturity Videos
- YouTube: The Encyclopedia of Immaturity Videos
- Klutz: The Encyclopedia of Immaturity Videos
- Klutz Video: Put Your Eye Out (Time: 0:50)
The Encyclopedia of Immaturity Author Information
- Wikipedia: John Cassidy | Klutz Press
- Klutz: Klutz History
- Publisher's Weekly: Still Klutzy After All These Years (September 17, 2007)
- The Write News: Scholastic Corporation Acquires Klutz (March 8, 2002)
The Encyclopedia of Immaturity Books and Merchandise
- Google Product Search: Encyclopedia of Immaturity Merchandise
- Barnes & Noble: Klutz: The Encyclopedia of Immaturity
- Books-A-Million: The Encyclopedia of Immaturity: How to Never Grow Up
- Discovery Channel Store: Klutz® Encyclopedia of Immaturity Book
- Fat Brain Toys: Encyclopedia of Immaturity
The Encyclopedia of Immaturity Blogs and Message Boards
- Signposts: Step Aside Yoda (August 5, 2008)
- Fendalton Tech Wizards: The Encyclopedia of Immaturity... (July 28, 2008)
- Beattie's Book Blog: Two Books for Kids of All Ages (November 22, 2007)
- Story Time Books: The Encyclopedia of Immaturity (October 18, 2007)