Dyfyniad APA

(2003). McGraw-Hill dictionary of earth science. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

McGraw-Hill Dictionary of Earth Science. New York: McGraw-Hill, 2003.

Dyfyniad MLA

McGraw-Hill Dictionary of Earth Science. New York: McGraw-Hill, 2003.

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