APA (7th ed.) Citation

Rusbridger, A. (2006). The coldest day in the zoo. Penguin Books.

Chicago Style (17th ed.) Citation

Rusbridger, Alan. The Coldest Day in the Zoo. England: Penguin Books, 2006.

MLA (9th ed.) Citation

Rusbridger, Alan. The Coldest Day in the Zoo. Penguin Books, 2006.

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