Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.