Cita APA (7a ed.)

Wallace, H., & Ridley, A. (1985). Europe, the challenge of diversity. Royal Institute of International Affairs [etc.].

Cita Chicago Style (17a ed.)

Wallace, Hellen, y Adam Ridley. Europe, the Challenge of Diversity. London: Royal Institute of International Affairs [etc.], 1985.

Cita MLA (9a ed.)

Wallace, Hellen, y Adam Ridley. Europe, the Challenge of Diversity. Royal Institute of International Affairs [etc.], 1985.