Field, B. C. (2002). Environmental economics: An introduction. McGraw-Hill/Irwin.
Dyfyniad Arddull ChicagoField, Barry C. Environmental Economics: An Introduction. McGraw-Hill/Irwin, 2002.
Dyfyniad MLAField, Barry C. Environmental Economics: An Introduction. McGraw-Hill/Irwin, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.