Cita APA (7th ed.)

Strahler, A., & Strahler, A. (2005). Physical geography: Science and systems of the human environment (3rd ed.). John wiley.

Cita Chicago (17th ed.)

Strahler, Alan, i Arthur Strahler. Physical Geography: Science and Systems of the Human Environment. 3rd ed. Hoboken: John wiley, 2005.

Cita MLA (9th ed.)

Strahler, Alan, i Arthur Strahler. Physical Geography: Science and Systems of the Human Environment. 3rd ed. John wiley, 2005.