Dyfyniad APA

Tietenberg, T. (2003). Environmental and natural resource economics (6th ed.). Pearson Education.

Dyfyniad Arddull Chicago

Tietenberg, Tom. Environmental and Natural Resource Economics. 6th ed. Delhi: Pearson Education, 2003.

Dyfyniad MLA

Tietenberg, Tom. Environmental and Natural Resource Economics. 6th ed. Pearson Education, 2003.

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