Dyfyniad APA

Robert, W. L., & George, R. R. W. (1990). Encyclopaedia of minerals/2nd ed (2nd ed.). Van Nostrand Reinhold Company.

Dyfyniad Arddull Chicago

Robert, Willard Lincoln, and Robert Rapp Weber George. Encyclopaedia of Minerals/2nd Ed. 2nd ed. New York: Van Nostrand Reinhold Company, 1990.

Dyfyniad MLA

Robert, Willard Lincoln, and Robert Rapp Weber George. Encyclopaedia of Minerals/2nd Ed. 2nd ed. Van Nostrand Reinhold Company, 1990.

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