APA (7e ed.) Bronvermelding

Collard, D. A. (1978). Altruism and economy: A study in non-selfish economics. Martin Robertson.

Chicago (17e ed.) Bronvermelding

Collard, David A. Altruism and Economy: A Study in Non-selfish Economics. Oxford: Martin Robertson, 1978.

MLA (9e ed.) Bronvermelding

Collard, David A. Altruism and Economy: A Study in Non-selfish Economics. Martin Robertson, 1978.