APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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