Dyfyniad APA

Tietenberg, T. H. (2006). Environmental and natural resource economics (7th edition.). Pearson/Addison Wesley.

Dyfyniad Arddull Chicago

Tietenberg, Thomas H. Environmental and Natural Resource Economics. 7th edition. Boston: Pearson/Addison Wesley, 2006.

Dyfyniad MLA

Tietenberg, Thomas H. Environmental and Natural Resource Economics. 7th edition. Pearson/Addison Wesley, 2006.

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