Dyfyniad APA

(2012). System of Environmental-Economic Accounting for water. United Nations.

Dyfyniad Arddull Chicago

System of Environmental-Economic Accounting for Water. New York: United Nations, 2012.

Dyfyniad MLA

System of Environmental-Economic Accounting for Water. United Nations, 2012.

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