Cita APA (7a ed.)

Gregory, K. J., & Walling, D. E. (1979). Man and environmental processes: A physical geography perspective. Dawson [etc.].

Cita Chicago Style (17a ed.)

Gregory, K. J., y D. E. Walling. Man and Environmental Processes: A Physical Geography Perspective. Folkestone: Dawson [etc.], 1979.

Cita MLA (8a ed.)

Gregory, K. J., y D. E. Walling. Man and Environmental Processes: A Physical Geography Perspective. Dawson [etc.], 1979.