APA (7th ed.) Zitazioa
Nelson, F. W. h., & Howard, D. S. (1986). Trace Element Analysis of Obsidian Artifacts from El Mirador, Guatemala. New World Archaeological Foundation : Brigham Young University.
Chicago Style (17th ed.) Zitazioa
Nelson, Fred W. hijo, eta David S. Howard. Trace Element Analysis of Obsidian Artifacts from El Mirador, Guatemala. Provo, EUA: New World Archaeological Foundation : Brigham Young University, 1986.
MLA (9th ed.) Zitazioa
Nelson, Fred W. hijo, eta David S. Howard. Trace Element Analysis of Obsidian Artifacts from El Mirador, Guatemala. New World Archaeological Foundation : Brigham Young University, 1986.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.