Dyfyniad APA

World Resources Institute & United Nations Environment Programme. (1986). World resources. World Resources Institute.

Dyfyniad Arddull Chicago

World Resources Institute and United Nations Environment Programme. World Resources. Washington, D.C.: World Resources Institute, 1986.

Dyfyniad MLA

World Resources Institute and United Nations Environment Programme. World Resources. World Resources Institute, 1986.

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