APA (7th ed.) Citation

Kolbert, E., & Twomey, A. (2014). The sixth extinction: An unnatural history. Audioworks.

Chicago Style (17th ed.) Citation

Kolbert, Elizabeth, and Anne Twomey. The Sixth Extinction: An Unnatural History. New York, NY: Audioworks, 2014.

MLA (8th ed.) Citation

Kolbert, Elizabeth, and Anne Twomey. The Sixth Extinction: An Unnatural History. Audioworks, 2014.

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