Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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