Dyfyniad APA

Tisdell, C. A. A. (2006). Economics of environmental conservation (2nd ed.).

Dyfyniad Arddull Chicago

Tisdell, Clement A; Author. Economics of Environmental Conservation. 2nd ed. Cheltenham (UK), Edward Elgar Publishing Ltd, 2006.

Dyfyniad MLA

Tisdell, Clement A; Author. Economics of Environmental Conservation. 2nd ed. 2006.

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