Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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