Dyfyniad APA

Tietenberg,Tom. (1996). Environmental and natural resource economics (4.). Harper Collins College Publishers.

Dyfyniad Arddull Chicago

Tietenberg,Tom. Environmental and Natural Resource Economics. 4. New York: Harper Collins College Publishers, 1996.

Dyfyniad MLA

Tietenberg,Tom. Environmental and Natural Resource Economics. 4. Harper Collins College Publishers, 1996.

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