APA (7th ed.) Citation

Focus Features, This is That (Firm), Y Productions (Firm), Universal Pictures (Firm), González Iñárritu, A., Salerno, R., . . . Broch, B. (2006). 21 grams (Collector's edition.). Universal Pictures.

Chicago Style (17th ed.) Citation

Focus Features, et al. 21 Grams. Collector's edition. Universal City, CA: Universal Pictures, 2006.

MLA (9th ed.) Citation

Focus Features, et al. 21 Grams. Collector's edition. Universal Pictures, 2006.