APA (7th ed.) Citation

Butcher, J., & Marsters, J. (2012). Cold days: A novel of the Dresden files. Penguin Audio.

Chicago Style (17th ed.) Citation

Butcher, Jim, and James Marsters. Cold Days: A Novel of the Dresden Files. [New York]: Penguin Audio, 2012.

MLA (8th ed.) Citation

Butcher, Jim, and James Marsters. Cold Days: A Novel of the Dresden Files. Penguin Audio, 2012.

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