Cita APA (7a ed.)

Douglas, I., Huggett, R. J., & Robinson, M. E. (1996). Companion encyclopedia of geography: The environment and humankind. Routledge.

Cita Chicago Style (17a ed.)

Douglas, Ian, Richard J. Huggett, y M. E. Robinson. Companion Encyclopedia of Geography: The Environment and Humankind. London ; New York: Routledge, 1996.

Cita MLA (8a ed.)

Douglas, Ian, et al. Companion Encyclopedia of Geography: The Environment and Humankind. Routledge, 1996.