Dyfyniad APA

Field, B. C., & Field, B. C. (2006). Environmental Economics: An introductionBarry C. Field and Martha K. Field. McGraw-Hill.

Dyfyniad Arddull Chicago

Field, Barry C., and Barry C. Field. Environmental Economics: An IntroductionBarry C. Field and Martha K. Field. McGraw-Hill, 2006.

Dyfyniad MLA

Field, Barry C., and Barry C. Field. Environmental Economics: An IntroductionBarry C. Field and Martha K. Field. McGraw-Hill, 2006.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.