Cita APA (7th ed.)

Duck, S. (2007). Human relationships (4th ed.). Sage Pub.

Cita Chicago (17th ed.)

Duck, Steve. Human Relationships. 4th ed. Los Angeles, Calif: Sage Pub, 2007.

Cita MLA (9th ed.)

Duck, Steve. Human Relationships. 4th ed. Sage Pub, 2007.