Dyfyniad APA

FIELD, B. C. F. (2011). Environmental economics: An introduction. McGraw Hill Education.

Dyfyniad Arddull Chicago

FIELD, Barry C. Field. Environmental Economics: An Introduction. McGraw Hill Education, 2011.

Dyfyniad MLA

FIELD, Barry C. Field. Environmental Economics: An Introduction. McGraw Hill Education, 2011.

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