FIELD, B. C. F. (2011). Environmental economics: An introduction. McGraw Hill Education.
Lua i Stíl Chicago (17ú heag.)FIELD, Barry C. Field. Environmental Economics: An Introduction. McGraw Hill Education, 2011.
Lua MLA (9ú heag.)FIELD, Barry C. Field. Environmental Economics: An Introduction. McGraw Hill Education, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.