Johnson, G. V., & Johnson, R. L. (1990). Economic valuation of natural resources: Issues, theory, and applications. Westview Press.
Citace podle Chicago (17th ed.)Johnson, Gary V., a Rebecca L. Johnson. Economic Valuation of Natural Resources: Issues, Theory, and Applications. Boulder: Westview Press, 1990.
Citace podle MLA (9th ed.)Johnson, Gary V., a Rebecca L. Johnson. Economic Valuation of Natural Resources: Issues, Theory, and Applications. Westview Press, 1990.
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