Cita APA (7th ed.)

World Resources Institute, United Nations Environment Programme, & United Nations Development Programme. (1990). World resources. Oxford University Press.

Cita Chicago (17th ed.)

World Resources Institute, United Nations Environment Programme, i United Nations Development Programme. World Resources. New York: Oxford University Press, 1990.

Cita MLA (8th ed.)

World Resources Institute, et al. World Resources. Oxford University Press, 1990.