APA (7th ed.) Citation

Keenan, S., Burns, M., & Girouard, P. (1997). More or less a mess. Scholastic Inc..

Chicago Style (17th ed.) Citation

Keenan, Sheila, Marilyn Burns, and Patrick Girouard. More or Less a Mess. New York: Scholastic Inc., 1997.

MLA (9th ed.) Citation

Keenan, Sheila, et al. More or Less a Mess. Scholastic Inc., 1997.