Cita APA

Dohrs, F. E., & Sommers, L. M. (1967). Introduction to geography: Selected readings. New York: Crowell.

Citación estilo Chicago

Dohrs, Fred E., y Lawrence M. Sommers. Introduction to Geography: Selected Readings. New York: Crowell, 1967.

Cita MLA

Dohrs, Fred E., y Lawrence M. Sommers. Introduction to Geography: Selected Readings. New York: Crowell, 1967.