APA (7th ed.) Zitazioa
Norman, V. G. (1973). Izapa sculpture. New World Archaeological Foundation.
Chicago Style (17th ed.) Zitazioa
Norman, V. Garth. Izapa Sculpture. Provo, Utah: New World Archaeological Foundation, 1973.
MLA (9th ed.) Zitazioa
Norman, V. Garth. Izapa Sculpture. New World Archaeological Foundation, 1973.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.