APA (7th ed.) Citation

Berg, P. v. d., Molleman, L., Junikka, J., Puurtinen, M., & Weissing, F. J. (2015). Human cooperation in groups: Variation begets variation. Nature Publishing Group.

Chicago Style (17th ed.) Citation

Berg, Pieter van den, Lucas Molleman, Jaakko Junikka, Mikael Puurtinen, and Franz J. Weissing. Human Cooperation in Groups: Variation Begets Variation. Nature Publishing Group, 2015.

MLA (9th ed.) Citation

Berg, Pieter van den, et al. Human Cooperation in Groups: Variation Begets Variation. Nature Publishing Group, 2015.