Govett, G. J. S., Govett, M. H., & Govett, G. (1976). World mineral supplies: Assessment and perspective. Amsterdam New York: Elsevier Scientific Pub. Co..
Παραπομπή Chicago StyleGovett, G. J. S., M. H. Govett, and G.J.S Govett. World Mineral Supplies: Assessment and Perspective. Amsterdam New York: Elsevier Scientific Pub. Co., 1976.
Παραπομπή MLAGovett, G. J. S., M. H. Govett, and G.J.S Govett. World Mineral Supplies: Assessment and Perspective. Amsterdam New York: Elsevier Scientific Pub. Co., 1976.
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