Dyfyniad APA

Parker, S. P. (1997). Dictionary of earth science (International edition.). McGraw-Hill.

Dyfyniad Arddull Chicago

Parker, Sybil P. Dictionary of Earth Science. International edition. New York: McGraw-Hill, 1997.

Dyfyniad MLA

Parker, Sybil P. Dictionary of Earth Science. International edition. McGraw-Hill, 1997.

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