Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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