APA (7th ed.) Zitazioa
Clark, G. (1961). World prehistory: An outline. University Press.
Chicago Style (17th ed.) Zitazioa
Clark, Grahame. World Prehistory: An Outline. Cambridge: University Press, 1961.
MLA (9th ed.) Zitazioa
Clark, Grahame. World Prehistory: An Outline. University Press, 1961.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.