Dyfyniad APA

Parker, S. P. (1997). McGraw-Hill dictionary of earth sciences. McGraw-Hill.

Dyfyniad Arddull Chicago

Parker, Sybil P. McGraw-Hill Dictionary of Earth Sciences. New York: McGraw-Hill, 1997.

Dyfyniad MLA

Parker, Sybil P. McGraw-Hill Dictionary of Earth Sciences. McGraw-Hill, 1997.

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