APA (7th ed.) Citation

Roberts, W. L., Campbell, T. J., & Rapp, G. R. (1990). Encyclopedia of minerals (2nd ed.). Van Nostrand Reinhold.

Chicago Style (17th ed.) Citation

Roberts, Willard Lincoln, Thomas J. Campbell, and George Robert Rapp. Encyclopedia of Minerals. 2nd ed. New York: Van Nostrand Reinhold, 1990.

MLA (8th ed.) Citation

Roberts, Willard Lincoln, et al. Encyclopedia of Minerals. 2nd ed. Van Nostrand Reinhold, 1990.