Dyfyniad APA

Tietenberg, T. H., & Lewis, L. (2015). Environmental & natural resource economics (10th and global Edition.). Pearson.

Dyfyniad Arddull Chicago

Tietenberg, Thomas H., and Lynne Lewis. Environmental & Natural Resource Economics. 10th and global Edition. Boston: Pearson, 2015.

Dyfyniad MLA

Tietenberg, Thomas H., and Lynne Lewis. Environmental & Natural Resource Economics. 10th and global Edition. Pearson, 2015.

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