Coe, R. T. (1977). Sacred circles: Two thousand years of North American Indian art / catalogue by Ralph T. Coe.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCoe, Ralph T. Sacred Circles: Two Thousand Years of North American Indian Art / Catalogue by Ralph T. Coe. London, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCoe, Ralph T. Sacred Circles: Two Thousand Years of North American Indian Art / Catalogue by Ralph T. Coe. 1977.
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