Field, B. C., & Field, B. C. (2006). Environmental Economics: An introductionBarry C. Field and Martha K. Field. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Field, Barry C., agus Barry C. Field. Environmental Economics: An IntroductionBarry C. Field and Martha K. Field. McGraw-Hill, 2006.
Lua MLA (8ú heag.)Field, Barry C., agus Barry C. Field. Environmental Economics: An IntroductionBarry C. Field and Martha K. Field. McGraw-Hill, 2006.
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