APA (7th ed.) Zitazioa
Webby, B. D. (2004). The great Ordovician biodiversification event. Columbia University Press.
Chicago Style (17th ed.) Zitazioa
Webby, B. D. The Great Ordovician Biodiversification Event. New York ; Chichester, England: Columbia University Press, 2004.
MLA (9th ed.) Zitazioa
Webby, B. D. The Great Ordovician Biodiversification Event. Columbia University Press, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.