APA (7th ed.) Citation

Portis, A. (2009). A penguin story. HarperCollins.

Chicago Style (17th ed.) Citation

Portis, Antoinette. A Penguin Story. New York: HarperCollins, 2009.

MLA (8th ed.) Citation

Portis, Antoinette. A Penguin Story. HarperCollins, 2009.

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