Cita APA

Greenland, D., & De Bill, H. J. (1977). The earth in profile: A physical geography. San Francisco: Canfield Press.

Citación estilo Chicago

Greenland, David, y Harm J. De Bill. The Earth in Profile: A Physical Geography. San Francisco: Canfield Press, 1977.

Cita MLA

Greenland, David, y Harm J. De Bill. The Earth in Profile: A Physical Geography. San Francisco: Canfield Press, 1977.