Ewers, J. C. (1958). The Blackfeet; raiders on the Northwestern Plains ([1st ed.].). University of Oklahoma Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEwers, John C. The Blackfeet; Raiders on the Northwestern Plains. [1st ed.]. Norman: University of Oklahoma Press, 1958.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEwers, John C. The Blackfeet; Raiders on the Northwestern Plains. [1st ed.]. University of Oklahoma Press, 1958.
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