Cita APA

Duffield, A., & Duffield, A. (1981). The prospects of Peru. London, Sydney: Newman Press.

Citación estilo Chicago

Duffield, A.J., y A.J Duffield. The Prospects of Peru. London, Sydney: Newman Press, 1981.

Cita MLA

Duffield, A.J., y A.J Duffield. The Prospects of Peru. London, Sydney: Newman Press, 1981.