APA (7th ed.) Zitazioa
Graham, A. (1999). Late Cretaceous and Cenozoic history of North American vegetation, north of Mexico. Oxford University Press.
Chicago Style (17th ed.) Zitazioa
Graham, Alan. Late Cretaceous and Cenozoic History of North American Vegetation, North of Mexico. New York: Oxford University Press, 1999.
MLA (9th ed.) Zitazioa
Graham, Alan. Late Cretaceous and Cenozoic History of North American Vegetation, North of Mexico. Oxford University Press, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.