Callan, S., & Thomas, J. M. (1996). Environmental economics and management: Theory, policy, and applications. Irwin.
Lua i Stíl Chicago (17ú heag.)Callan, Scott, agus Janet M. Thomas. Environmental Economics and Management: Theory, Policy, and Applications. Chicago: Irwin, 1996.
Lua MLA (8ú heag.)Callan, Scott, agus Janet M. Thomas. Environmental Economics and Management: Theory, Policy, and Applications. Irwin, 1996.
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