Dyfyniad APA
Graham, A. (1999). Late Cretaceous and Cenozoic history of North American vegetation, north of Mexico. Oxford University Press.
Dyfyniad Arddull Chicago
Graham, Alan. Late Cretaceous and Cenozoic History of North American Vegetation, North of Mexico. New York: Oxford University Press, 1999.
Dyfyniad MLA
Graham, Alan. Late Cretaceous and Cenozoic History of North American Vegetation, North of Mexico. Oxford University Press, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.