Roger Perman. (1999). Natural resource environmental economics. Financial Times, Prentice-Hall / Person Education.
Citace podle Chicago (17th ed.)Roger Perman. Natural Resource Environmental Economics. Harlow: Financial Times, Prentice-Hall / Person Education, 1999.
Citace podle MLA (9th ed.)Roger Perman. Natural Resource Environmental Economics. Financial Times, Prentice-Hall / Person Education, 1999.
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