Cita APA (7a ed.)

Duck, S., & Gilmour, R. (1981). Developing personal relationships. Academic Press.

Cita Chicago Style (17a ed.)

Duck, Steve, y Robin Gilmour. Developing Personal Relationships. London [etc.]: Academic Press, 1981.

Cita MLA (9a ed.)

Duck, Steve, y Robin Gilmour. Developing Personal Relationships. Academic Press, 1981.