APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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