World Resources Institute. A Guide to world resources 2002-2004: Desicions for the earth balance, voice and power. S.n.
Cita Chicago Style (17a ed.)World Resources Institute. A Guide to World Resources 2002-2004: Desicions for the Earth Balance, Voice and Power. Washington, D.C.: S.n.
Cita MLA (9a ed.)World Resources Institute. A Guide to World Resources 2002-2004: Desicions for the Earth Balance, Voice and Power. S.n.
警告：这些引文格式不一定是100％准确.