APA (7th ed.) Zitazioa
Johnson, D. M. (2011). Three prehistoric inventions that shaped us. Peter Lang.
Chicago Style (17th ed.) Zitazioa
Johnson, David Martel. Three Prehistoric Inventions That Shaped Us. New York: Peter Lang, 2011.
MLA (9th ed.) Zitazioa
Johnson, David Martel. Three Prehistoric Inventions That Shaped Us. Peter Lang, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.