APA (7th ed.) Citation

Martin, B., & Everitt, B. (1991). The happy hippopotami. Harcourt Brace Jovanovich.

Chicago Style (17th ed.) Citation

Martin, Bill, and Betsy Everitt. The Happy Hippopotami. San Diego: Harcourt Brace Jovanovich, 1991.

MLA (9th ed.) Citation

Martin, Bill, and Betsy Everitt. The Happy Hippopotami. Harcourt Brace Jovanovich, 1991.