Cita APA (7th ed.)

PENCK, W. (1972). Morphological analysis of land forms: A contribution to physical geology. Hafner.

Cita Chicago (17th ed.)

PENCK, Walther. Morphological Analysis of Land Forms: A Contribution to Physical Geology. New York: Hafner, 1972.

Cita MLA (9th ed.)

PENCK, Walther. Morphological Analysis of Land Forms: A Contribution to Physical Geology. Hafner, 1972.