APA (7th ed.) Zitazioa
(1973). Primitive worlds: People lost in time (ed.). National geographical society.
Chicago Style (17th ed.) Zitazioa
Primitive Worlds: People Lost in Time. ed. Washington: National geographical society, 1973.
MLA (9th ed.) Zitazioa
Primitive Worlds: People Lost in Time. ed. National geographical society, 1973.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.