BOOKS
Armentrout, David and Patricia. How Can I Experiment With a Wheel? Vero Beach, Fla.: Rourke Pub., 2003.
Bodden, Valerie. Wheels & Axles. Mankato, Minn.: Creative Education, 2011.
Prince, April Jones. What Do Wheels Do All Day? Boston: Houghton Mifflin, 2006.