Johansen, H. E., Matthews, O. P., & Rudzitis, G. (1987). Mineral resource development: Geopolitics, economics, and policy. Westview Press.
Style de citation Chicago (17e éd.)Johansen, Harley E., Olen Paul Matthews, et Gundars Rudzitis. Mineral Resource Development: Geopolitics, Economics, and Policy. Boulder, Colo: Westview Press, 1987.
Style de citation MLA (9e éd.)Johansen, Harley E., et al. Mineral Resource Development: Geopolitics, Economics, and Policy. Westview Press, 1987.
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