APA (7th ed.) Citation

Schiefel, M., Kögel, C., & Schmidt, A. (2003). Gay. Marcus <<[u.a.]>>.

Chicago Style (17th ed.) Citation

Schiefel, Michael, Christian Kögel, and Andreas Schmidt. Gay. Berlin: Marcus <<[u.a.]>>, 2003.

MLA (9th ed.) Citation

Schiefel, Michael, et al. Gay. Marcus <<[u.a.]>>, 2003.