APA (7th ed.) Citation

McCullough, D. G., & Herrmann, E. (2004). Mornings on horseback. Simon & Schuster Audio.

Chicago Style (17th ed.) Citation

McCullough, David G., and Edward Herrmann. Mornings on Horseback. New York, NY: Simon & Schuster Audio, 2004.

MLA (9th ed.) Citation

McCullough, David G., and Edward Herrmann. Mornings on Horseback. Simon & Schuster Audio, 2004.