APA (7th ed.) Citation

Millar, M., Kubert, A., & Kubert, A. (2001). Ultimate X-Men. Marvel Comics.

Chicago Style (17th ed.) Citation

Millar, Mark, Adam Kubert, and Andy Kubert. Ultimate X-Men. New York: Marvel Comics, 2001.

MLA (9th ed.) Citation

Millar, Mark, et al. Ultimate X-Men. Marvel Comics, 2001.