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