FIELD, B. C. (1994). Environmental Economics. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)FIELD, Barry C. Environmental Economics. McGraw-Hill, 1994.
Lua MLA (8ú heag.)FIELD, Barry C. Environmental Economics. McGraw-Hill, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.