World Resources Institute, United Nations Environment Programme, & United Nations Development Programme. (1990). World resources. Oxford University Press.
Čikaški stil citiranja (17. izdanje)World Resources Institute, United Nations Environment Programme, i United Nations Development Programme. World Resources. New York: Oxford University Press, 1990.
MLA način citiranja (8. izdanje)World Resources Institute, et al. World Resources. Oxford University Press, 1990.
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