APA (7th ed.) Citation

Green, J., & Campbell, C. (2010). Promises to keep. Penguin Audio.

Chicago Style (17th ed.) Citation

Green, Jane, and Cassandra Campbell. Promises to Keep. [New York]: Penguin Audio, 2010.

MLA (9th ed.) Citation

Green, Jane, and Cassandra Campbell. Promises to Keep. Penguin Audio, 2010.