Gray, H. E. (1992). Ni-kso-ko-wa: Blackfoot spirituality, traditions, values and beliefs. Spirit Talk Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGray, Harold E. Ni-kso-ko-wa: Blackfoot Spirituality, Traditions, Values and Beliefs. Browning, Mont.: Spirit Talk Press, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGray, Harold E. Ni-kso-ko-wa: Blackfoot Spirituality, Traditions, Values and Beliefs. Spirit Talk Press, 1992.
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