APA (7th ed.) Citation

Bluebush Productions, FX Productions, Twentieth Century Fox Home Entertainment, Inc, Day, C., McElhenney, R., Howerton, G., . . . DeVito, D. (2009). It's always sunny in Philadelphia. 20th Century Fox Home Entertainment.

Chicago Style (17th ed.) Citation

Bluebush Productions, FX Productions, Inc Twentieth Century Fox Home Entertainment, Charlie Day, Rob McElhenney, Glenn Howerton, Kaitlin Olson, and Danny DeVito. It's Always Sunny in Philadelphia. Beverly Hills, Calif.: 20th Century Fox Home Entertainment, 2009.

MLA (9th ed.) Citation

Bluebush Productions, et al. It's Always Sunny in Philadelphia. 20th Century Fox Home Entertainment, 2009.