Cita APA (7a ed.)

Duck, S. (1985). Understanding personal relationships: An interdisciplinary approach. Sage.

Cita Chicago Style (17a ed.)

Duck, Steve. Understanding Personal Relationships: An Interdisciplinary Approach. London [u.a.]: Sage, 1985.

Cita MLA (9a ed.)

Duck, Steve. Understanding Personal Relationships: An Interdisciplinary Approach. Sage, 1985.