Dyfyniad APA

Field, B. C., & Field, M. K. (2017). Environmental Economics: An Introduction. Mc Graw Hill Education.

Dyfyniad Arddull Chicago

Field, Barry C., and Martha K. Field. Environmental Economics: An Introduction. New York: Mc Graw Hill Education, 2017.

Dyfyniad MLA

Field, Barry C., and Martha K. Field. Environmental Economics: An Introduction. Mc Graw Hill Education, 2017.

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