Dyfyniad APA

Roberts, W. L., & George, R. R. W. (1974). Encyclopaedia of minerals. Van Nostrand Reinhold Company.

Dyfyniad Arddull Chicago

Roberts, Willard Lincoln, and Robert Rapp Weber George. Encyclopaedia of Minerals. New York: Van Nostrand Reinhold Company, 1974.

Dyfyniad MLA

Roberts, Willard Lincoln, and Robert Rapp Weber George. Encyclopaedia of Minerals. Van Nostrand Reinhold Company, 1974.

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