APA (7th ed.) Citation

Strahler, A. H., & Strahler, A. N. (1994). Introducing physical geography. John Wiley.

Chicago Style (17th ed.) Citation

Strahler, Alan H., and Arthur Newell Strahler. Introducing Physical Geography. New York: John Wiley, 1994.

MLA (9th ed.) Citation

Strahler, Alan H., and Arthur Newell Strahler. Introducing Physical Geography. John Wiley, 1994.