APA (7th ed.) Zitazioa

Blum, L. A. (1980). Friendship, altruism and morality. Routledge.

Chicago Style (17th ed.) Zitazioa

Blum, Lawrence A. Friendship, Altruism and Morality. London: Routledge, 1980.

MLA (9th ed.) Zitazioa

Blum, Lawrence A. Friendship, Altruism and Morality. Routledge, 1980.