APA aipamena

Cooper, B., & Wallace, C. (2001). Group selection and the evolution of altruism. University of Oxford.

Chicago Style aipamena

Cooper, B., and C. Wallace. Group Selection and the Evolution of Altruism. University of Oxford, 2001.

MLA aipamena

Cooper, B., and C. Wallace. Group Selection and the Evolution of Altruism. University of Oxford, 2001.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.