Dyfyniad APA

(2003). World resources 2002-2004: Decisions for the earth : balance, voice and power. Washington, D.C: World Resources Institute.

Dyfyniad Arddull Chicago

World Resources 2002-2004: Decisions for the Earth : Balance, Voice and Power. Washington, D.C: World Resources Institute, 2003.

Dyfyniad MLA

World Resources 2002-2004: Decisions for the Earth : Balance, Voice and Power. Washington, D.C: World Resources Institute, 2003.

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