Dyfyniad APA

U.S. Geological Survey, U. (1962). American Mineralogist, vol.47, (1-12).

Dyfyniad Arddull Chicago

U.S. Geological Survey, U.S.A. American Mineralogist, Vol.47, (1-12). U.S. Geological Survey, U.S.A, 1962.

Dyfyniad MLA

U.S. Geological Survey, U.S.A. American Mineralogist, Vol.47, (1-12). 1962.

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