Ewers, J. C. (1974). Ethnological report on the Blackfeet and Gros Ventre Tribes of Indians. Garland Pub. Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEwers, John C. Ethnological Report on the Blackfeet and Gros Ventre Tribes of Indians. New York: Garland Pub. Inc., 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEwers, John C. Ethnological Report on the Blackfeet and Gros Ventre Tribes of Indians. Garland Pub. Inc., 1974.
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