Dyfyniad APA

Morris, J. W., & Freeman, O. W. (1972). World geography (3d ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Morris, John W., and Otis Willard Freeman. World Geography. 3d ed. New York: McGraw-Hill, 1972.

Dyfyniad MLA

Morris, John W., and Otis Willard Freeman. World Geography. 3d ed. McGraw-Hill, 1972.

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