Cita APA

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

Citación estilo Chicago

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

Cita MLA

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