Cita APA (7a ed.)

Alexander, R. D. (1987). The biology of moral systems. Aldine de Gruyter.

Cita Chicago Style (17a ed.)

Alexander, Richard D. The Biology of Moral Systems. New York: Aldine de Gruyter, 1987.

Cita MLA (9a ed.)

Alexander, Richard D. The Biology of Moral Systems. Aldine de Gruyter, 1987.