Cita APA (7th ed.)

Strahler, A. H., & Strahler, A. N. (1998). Introducing physical geography (2nd ed.). Wiley.

Cita Chicago (17th ed.)

Strahler, Alan H., i Arthur Newell Strahler. Introducing Physical Geography. 2nd ed. New York: Wiley, 1998.

Cita MLA (9th ed.)

Strahler, Alan H., i Arthur Newell Strahler. Introducing Physical Geography. 2nd ed. Wiley, 1998.