APA (7th ed.) Citation

Feigel, A., Englander, A., & Engel, A. (2009). Sex is always well worth its two-fold cost. Public Library of Science (PLoS).

Chicago Style (17th ed.) Citation

Feigel, Alexander, Avraham Englander, and Assaf Engel. Sex Is Always Well Worth Its Two-fold Cost. Public Library of Science (PLoS), 2009.

MLA (8th ed.) Citation

Feigel, Alexander, et al. Sex Is Always Well Worth Its Two-fold Cost. Public Library of Science (PLoS), 2009.