Dyfyniad APA

Field, B. C. (2002). Environmental economics: An introduction. Boston, MA: McGraw-Hill/Irwin.

Dyfyniad Arddull Chicago

Field, Barry C. Environmental Economics: An Introduction. Boston, MA: McGraw-Hill/Irwin, 2002.

Dyfyniad MLA

Field, Barry C. Environmental Economics: An Introduction. Boston, MA: McGraw-Hill/Irwin, 2002.

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