Field, B. C. (2001). Natural resource economics: An introduction/Barry C. Field. McGraw-Hill.
Dyfyniad Arddull ChicagoField, Barry C. Natural Resource Economics: An Introduction/Barry C. Field. McGraw-Hill, 2001.
Dyfyniad MLAField, Barry C. Natural Resource Economics: An Introduction/Barry C. Field. McGraw-Hill, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.