Dyfyniad APA

Thoman, R. S. (1974). The geography of economic activity (3rd ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Thoman, Richard S. The Geography of Economic Activity. 3rd ed. New York: McGraw-Hill, 1974.

Dyfyniad MLA

Thoman, Richard S. The Geography of Economic Activity. 3rd ed. McGraw-Hill, 1974.

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