Engel, F. A., & Gordon, R. K. (1976). An ancient world preserved: Relics and records of prehistory in the Andes (Revised and updated.). Crown Publishers.
Lua i Stíl Chicago (17ú heag.)Engel, Frédéric André, agus Rachel Kendall Gordon. An Ancient World Preserved: Relics and Records of Prehistory in the Andes. Revised and updated. New York: Crown Publishers, 1976.
Lua MLA (9ú heag.)Engel, Frédéric André, agus Rachel Kendall Gordon. An Ancient World Preserved: Relics and Records of Prehistory in the Andes. Revised and updated. Crown Publishers, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.