Cita APA (7a ed.)

Sober, E., & Wilson, D. S. (1999). Unto others: The evolution and psychology of unselfish behavior (1st Harvard University Press pbk. ed.). Harvard University Press.

Cita Chicago Style (17a ed.)

Sober, Elliott, y David Sloan Wilson. Unto Others: The Evolution and Psychology of Unselfish Behavior. 1st Harvard University Press pbk. ed. Cambridge (Massachusetts) [etc.]: Harvard University Press, 1999.

Cita MLA (9a ed.)

Sober, Elliott, y David Sloan Wilson. Unto Others: The Evolution and Psychology of Unselfish Behavior. 1st Harvard University Press pbk. ed. Harvard University Press, 1999.