APA استشهاد

Strahler, A. N. (1969). Physical geography (3rd. ed.). Wiley Eastern.

استشهاد بنمط شيكاغو

Strahler, Arthur N. Physical Geography. 3rd. ed. New Delhi: Wiley Eastern, 1969.

MLA استشهاد

Strahler, Arthur N. Physical Geography. 3rd. ed. Wiley Eastern, 1969.