Dyfyniad APA

Tom, T. (2000). Environmental and natural resources economics (5th ed.). Addison-Wesley.

Dyfyniad Arddull Chicago

Tom, Tietenberg. Environmental and Natural Resources Economics. 5th ed. Massachusetts: Addison-Wesley, 2000.

Dyfyniad MLA

Tom, Tietenberg. Environmental and Natural Resources Economics. 5th ed. Addison-Wesley, 2000.

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