Gaya APA

Strahler, A, N., Strahler, A, H. (1983). Modern physical geography (2nd.ed.). New Delhi: John Wiley & Sons, Inc..

Gaya MLA

Strahler, Arthur, N.., Strahler, Alan, H.. "Modern physical geography". 2nd.ed. New Delhi: John Wiley & Sons, Inc., 1983. Text.