Dyfyniad APA

Field, B. C., & Field, M. K. (2016). Environmental economics: An introduction (Seventh Edition.). McGraw-Hill Education.

Dyfyniad Arddull Chicago

Field, Barry C., and Martha K. Field. Environmental Economics: An Introduction. Seventh Edition. Dubuque: McGraw-Hill Education, 2016.

Dyfyniad MLA

Field, Barry C., and Martha K. Field. Environmental Economics: An Introduction. Seventh Edition. McGraw-Hill Education, 2016.

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