Crowson, P. C. F. (1996). Minerals handbook 1996-97: Statistics & analyses of the world's minerals industry (8th ed.). New York : London: Stockton Macmillan.
Παραπομπή Chicago StyleCrowson, P. C. F. Minerals Handbook 1996-97: Statistics & Analyses of the World's Minerals Industry. 8th ed. New York : London: Stockton Macmillan, 1996.
Παραπομπή MLACrowson, P. C. F. Minerals Handbook 1996-97: Statistics & Analyses of the World's Minerals Industry. 8th ed. New York : London: Stockton Macmillan, 1996.
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