APA (7th ed.) Citation

Traviss, K., & Morton, E. (2011). Halo (Unabridged.). Macmillan Audio.

Chicago Style (17th ed.) Citation

Traviss, Karen, and Euan Morton. Halo. Unabridged. New York: Macmillan Audio, 2011.

MLA (9th ed.) Citation

Traviss, Karen, and Euan Morton. Halo. Unabridged. Macmillan Audio, 2011.