Thompson, David (1971). "Life with the Nahathaways". Travels in western North America, 1784–1812. Macmillan of Canada. p. 109. ISBN9780770512125. The French Canadians...call them 'Krees', a name which none of the Indians can pronounce...
Greeberg, Adolph M.; Morrison, James (1982). "Group Identities in the Boreal Forest: The Origin of the Northern Ojibwa". Ethnohistory. 29 (2): 75–102. doi:10.2307/481370. JSTOR481370.
ethnologue.com
"Languages of Canada". Ethnologue: Languages of the World. Retrieved 21 September 2008. Note: The western group of languages includes Swampy Cree, Woods Cree and Plains Cree. The eastern language is called Moose Cree.
Greeberg, Adolph M.; Morrison, James (1982). "Group Identities in the Boreal Forest: The Origin of the Northern Ojibwa". Ethnohistory. 29 (2): 75–102. doi:10.2307/481370. JSTOR481370.