Dyfyniad APA

Strahler, A. H., & Strahler, A. N. (1992). Modern physical geography (4th.). John Wiley & Sons.

Dyfyniad Arddull Chicago

Strahler, Alan H., and Arthur N. Strahler. Modern Physical Geography. 4th. Canada: John Wiley & Sons, 1992.

Dyfyniad MLA

Strahler, Alan H., and Arthur N. Strahler. Modern Physical Geography. 4th. John Wiley & Sons, 1992.

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