Here are 23 of his books, but it's important to note that there are many more:
1. Maniac Magee (1990)
2. Stargirl (2000)
3. Wringer (1997)
4. Knots in My Yo-Yo String (1979)
5. Space Station Seventh Grade (1982)
6. There's a Boy in the Girls' Bathroom (1998)
7. Milkweed (2003)
8. The Seventh Grave (2005)
9. Crash (2004)
10. My Thirteenth Winter (2006)
11. Time Warp Trio series (1996-2005)
* The Time Warp Trio
* The Time Warp Trio #2: The Time Warp Trio Goes to Egypt
* The Time Warp Trio #3: The Time Warp Trio Meets the Blues
* The Time Warp Trio #4: The Time Warp Trio Takes a Dive
* The Time Warp Trio #5: The Time Warp Trio Rides the Rails
* The Time Warp Trio #6: The Time Warp Trio and the Curse of the Ancients
* The Time Warp Trio #7: The Time Warp Trio Goes to the Moon
* The Time Warp Trio #8: The Time Warp Trio and the Great Brain Robbery
* The Time Warp Trio #9: The Time Warp Trio Meets the Genie
* The Time Warp Trio #10: The Time Warp Trio Goes to the Wild West
* The Time Warp Trio #11: The Time Warp Trio Goes to Dinosaur Island
12. Turtle in Paradise (2010)
13. The Beat-Up Yellow School Bus (2011)
14. The Great Pet Escape (2013)
15. The Rooster Who Crossed the Road (2015)
16. The Warden's Daughter (2016)
17. The Boy Who Cried Wolf (2017)
18. The Magic of Ordinary Things (2018)
19. The Girl Who Drank the Moon (2017) (co-authored with Kelly Barnhill)
20. Amelia Bedelia series (2008-2015) (co-authored with Peggy Parish)
* Amelia Bedelia Helps Out
* Amelia Bedelia, First Day of School
* Amelia Bedelia Goes Camping
* Amelia Bedelia, Happy Birthday
* Amelia Bedelia, The Family Reunion
21. The Sneaky, Snacky Squirrel (2014) (co-authored with Eileen Spinelli)
22. Sunny (2019) (co-authored with Laura Lacamara)
23. The Crossover (2014) (co-authored with Kwame Alexander)
This list includes his most well-known books, as well as some of his collaborations. It's worth exploring his full bibliography to discover even more of his wonderful work!