APA

Roberts W. L., Rapp G. R. & Campbell T. J. (1990). Encyclopedia of minerals. New York: Van Nostrand Reinhold.

Chicago

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

Harvard

Roberts W. L., Rapp G. R. and Campbell T. J. (1990). Encyclopedia of minerals. New York: Van Nostrand Reinhold.

MLA

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