Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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