APA (7th ed.) Zitazioa
Hardin, G. J. (1999). The ostrich factor: Our population myopia. Oxford University Press.
Chicago Style (17th ed.) Zitazioa
Hardin, Garrett James. The Ostrich Factor: Our Population Myopia. New York: Oxford University Press, 1999.
MLA (9th ed.) Zitazioa
Hardin, Garrett James. The Ostrich Factor: Our Population Myopia. Oxford University Press, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.