Cita APA (7th ed.)
Willey, G. R., & Smith, L. (1969). The ruins of Altar de Sacrificios, department of Peten, Guatemala: An introduction. The Peabody Museum.
Cita Chicago (17th ed.)
Willey, Gordon R., i Ledyard Smith. The Ruins of Altar De Sacrificios, Department of Peten, Guatemala: An Introduction. Cambridge, Massachusetts: The Peabody Museum, 1969.
Cita MLA (9th ed.)
Willey, Gordon R., i Ledyard Smith. The Ruins of Altar De Sacrificios, Department of Peten, Guatemala: An Introduction. The Peabody Museum, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.