Cita APA (7th ed.)

Engeln, O. D. v. (1942). Geomorphology, systematic and regional. The Macmillan Company.

Cita Chicago (17th ed.)

Engeln, O. D. von. Geomorphology, Systematic and Regional. New York: The Macmillan Company, 1942.

Cita MLA (9th ed.)

Engeln, O. D. von. Geomorphology, Systematic and Regional. The Macmillan Company, 1942.