Gore, A. (1993). Earth in the Balance: Ecology and the human spirit. Penguin Books.
Chicago Style (17th ed.) ZitazioaGore, Albert. Earth in the Balance: Ecology and the Human Spirit. New York: Penguin Books, 1993.
MLA (9th ed.) ZitazioaGore, Albert. Earth in the Balance: Ecology and the Human Spirit. Penguin Books, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.