Dyfyniad APA

Hartwick, J. M. (1986). The economics of natural resource use. Harper and Row.

Dyfyniad Arddull Chicago

Hartwick, John M. The Economics of Natural Resource Use. New York: Harper and Row, 1986.

Dyfyniad MLA

Hartwick, John M. The Economics of Natural Resource Use. Harper and Row, 1986.

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