APA (7th ed.) Citation

Strahler, A. N., & Strahler, A. H. (1989). Elements of physical geography (4th ed.). Wiley.

Chicago Style (17th ed.) Citation

Strahler, Arthur Newell, and Alan H. Strahler. Elements of Physical Geography. 4th ed. New York: Wiley, 1989.

MLA (9th ed.) Citation

Strahler, Arthur Newell, and Alan H. Strahler. Elements of Physical Geography. 4th ed. Wiley, 1989.