Gaya APA

Strahler, A., Strahler, A. (2005). Introducing physical geography : media version (3rd ed.). New Jersey: John Wiley & Sons, Inc..

Gaya MLA

Strahler, Alan., Strahler, Arthur. "Introducing physical geography : media version". 3rd ed. New Jersey: John Wiley & Sons, Inc., 2005. Text.