Callan, S. J. (1996). Environmental economics and management: Theory, policy and applications. Richard D. Irwin.
Lua i Stíl Chicago (17ú heag.)Callan, Scott J. Environmental Economics and Management: Theory, Policy and Applications. Chicago: Richard D. Irwin, 1996.
Lua MLA (9ú heag.)Callan, Scott J. Environmental Economics and Management: Theory, Policy and Applications. Richard D. Irwin, 1996.
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