Dyfyniad APA

IUCN--The World Conservation Union, (Nature Conservancy (U.S, & World Bank. (2005). ?How much is an ecosystem worth: Assessing the economic value of conservation. IUCN, the Nature Conservancy, the World Bank.

Dyfyniad Arddull Chicago

IUCN--The World Conservation Union, (Nature Conservancy (U.S, and World Bank. ?How Much Is an Ecosystem Worth: Assessing the Economic Value of Conservation. .Washington, DC: IUCN, the Nature Conservancy, the World Bank, 2005.

Dyfyniad MLA

IUCN--The World Conservation Union, et al. ?How Much Is an Ecosystem Worth: Assessing the Economic Value of Conservation. IUCN, the Nature Conservancy, the World Bank, 2005.

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