Dyfyniad APA

The World Resources Institute, United Nations Environment Programme, & United Nations Development Programme. (1992). World resources 1992-93. Oxford University Press.

Dyfyniad Arddull Chicago

The World Resources Institute, United Nations Environment Programme, and United Nations Development Programme. World Resources 1992-93. New York: Oxford University Press, 1992.

Dyfyniad MLA

The World Resources Institute, et al. World Resources 1992-93. Oxford University Press, 1992.

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