Engel, F. A., & Gordon, R. K. (1976). An ancient world preserved: Relics and records of prehistory in the Andes (Revised and updated.). Crown Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEngel, Frédéric André, और Rachel Kendall Gordon. An Ancient World Preserved: Relics and Records of Prehistory in the Andes. Revised and updated. New York: Crown Publishers, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEngel, Frédéric André, और Rachel Kendall Gordon. An Ancient World Preserved: Relics and Records of Prehistory in the Andes. Revised and updated. Crown Publishers, 1976.
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