a. (1994). World Resousces 1994 - 95: A guide to the global environment. New York: Oxford university Press.
Chicago Style aipamenaa. World Resousces 1994 - 95: A Guide to the Global Environment. New York: Oxford university Press, 1994.
MLA aipamenaa. World Resousces 1994 - 95: A Guide to the Global Environment. New York: Oxford university Press, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.