APA (7th ed.) Citation

Marzollo, J., & Wick, W. (2001). I spy little numbers. Scholastic Inc..

Chicago Style (17th ed.) Citation

Marzollo, Jean, and Walter Wick. I Spy Little Numbers. New York: Scholastic Inc., 2001.

MLA (9th ed.) Citation

Marzollo, Jean, and Walter Wick. I Spy Little Numbers. Scholastic Inc., 2001.