APA (7th ed.) Citation

Strahler, A. H., & Strahler, A. N. (2006). Introducing physical geography (4th ed.). Wiley.

Chicago Style (17th ed.) Citation

Strahler, Alan H., and Arthur Newell Strahler. Introducing Physical Geography. 4th ed. New York: Wiley, 2006.

MLA (9th ed.) Citation

Strahler, Alan H., and Arthur Newell Strahler. Introducing Physical Geography. 4th ed. Wiley, 2006.