APA (7th ed.) Citation

(2010). Hooray! There's a hippopotamus on our roof having a birthday party (1. publ.). Penguin.

Chicago Style (17th ed.) Citation

Hooray! There's a Hippopotamus on Our Roof Having a Birthday Party. 1. publ. Camberwell, Vic: Penguin, 2010.

MLA (9th ed.) Citation

Hooray! There's a Hippopotamus on Our Roof Having a Birthday Party. 1. publ. Penguin, 2010.

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