APA (7th ed.) Citation

Discovery Channel (Firm), Image Entertainment (Firm), & Indusfilms. (2009). Toughest race on Earth: Iditarod (Widescreen ed.). Distributed by Image Entertainment.

Chicago Style (17th ed.) Citation

Discovery Channel (Firm), Image Entertainment (Firm), and Indusfilms. Toughest Race on Earth: Iditarod. Widescreen ed. Chatsworth, Calif.: Distributed by Image Entertainment, 2009.

MLA (8th ed.) Citation

Discovery Channel (Firm), et al. Toughest Race on Earth: Iditarod. Widescreen ed. Distributed by Image Entertainment, 2009.

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