APA (7th ed.) Citation

Machatschek, F., Graul, H., & Rathjens, C. (1969). Geomorphology. American Elsevier Pub. Co..

Chicago Style (17th ed.) Citation

Machatschek, Fritz, Hans Graul, and Carl Rathjens. Geomorphology. New York: American Elsevier Pub. Co., 1969.

MLA (9th ed.) Citation

Machatschek, Fritz, et al. Geomorphology. American Elsevier Pub. Co., 1969.