Dyfyniad APA

Roberts, L. W. (1974). Encyclopedia of minerals. Van Nostrand reinhold company.

Dyfyniad Arddull Chicago

Roberts, Lincoln Willard. Encyclopedia of Minerals. New York: Van Nostrand reinhold company, 1974.

Dyfyniad MLA

Roberts, Lincoln Willard. Encyclopedia of Minerals. Van Nostrand reinhold company, 1974.

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