APA (7th ed.) Citation

Henkes, K., & Dronzek, L. (1999). Oh! Greenwillow Books.

Chicago Style (17th ed.) Citation

Henkes, Kevin, and Laura Dronzek. Oh! New York: Greenwillow Books, 1999.

MLA (8th ed.) Citation

Henkes, Kevin, and Laura Dronzek. Oh! Greenwillow Books, 1999.