Tohutoro APA (7th ed.)
Kula, E. (1994). Economics of natural resources and the environment (2nd. ed.). Chapman & Hall.
Tohutoru Kātū Chicago (17th ed.)
Kula, Erhun. Economics of Natural Resources and the Environment. 2nd. ed. London ; New York: Chapman & Hall, 1994.
Tohutoro MLA (9th ed.)
Kula, Erhun. Economics of Natural Resources and the Environment. 2nd. ed. Chapman & Hall, 1994.
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