APA (7th ed.) Citation

Prelutsky, J., & Urbanovic, J. (2012). I've lost my hippopotamus. Greenwillow Books.

Chicago Style (17th ed.) Citation

Prelutsky, Jack, and Jackie Urbanovic. I've Lost My Hippopotamus. New York: Greenwillow Books, 2012.

MLA (8th ed.) Citation

Prelutsky, Jack, and Jackie Urbanovic. I've Lost My Hippopotamus. Greenwillow Books, 2012.

Warning: These citations may not always be 100% accurate.