Cita APA (7th ed.)
Duck, S. (1992). Human relationships (2nd ed.). Sage.
Cita Chicago (17th ed.)
Duck, Steve. Human Relationships. 2nd ed. London: Sage, 1992.
Cita MLA (9th ed.)
Duck, Steve. Human Relationships. 2nd ed. Sage, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.