Those seeking more information about St. Kateri and her milieu should consult the sources below. This bibliography is certainly not exhaustive--although I'll continue to add to it. The books and resources below have been helpful to me as I've been making sketches and planning the portraits.
St. Kateri Tekakwitha and the Iroquois
Bonaparte, Darren. A Lilly Among Thorns: The Mohawk Repatriation of St. Kateri Tekakwitha. (BookSurge, 2009)
Greer, Allan. Mohawk Saint: Catherine Tekawitha and the Jesuits. (Oxford University Press, 2006)
Kasprycki, Sylvia et. al. On the Trails of the Iroquois (Kunst- und Ausstellungshalle der Bundesrepublik Deutschland, 2013)
Keating, Neal B. Iroquois Art, Power, and History. (University of Oklahoma Press, 2012)
Morgan, Lewis Henry. League of the Iroquois: A Classic Study of an American Indian Tribe With Original Illustrations (Citadel Press, 1984)
Parker, Arthur C. "Certain Iroquois Tree Myths and Symbols" in American Anthropologist, New Series, Vol. 14, No. 4 (Oct. - Dec., 1912), pp. 608-620.
Snow, Dean. The Iroquois. (Oxford University Press, 1994)
Spittal, W.G. Iroquois Women: An Anthology [Iroquois Reprints]. (Iroqrafts Ltd, 1990)
Materials, Methods, and Technical Information for Artists
Carlyle, Leslie. The Artist's Assistant. (Archetype Press, 2007)
Kirsch, Andrea, and Rustin S, Levenson. Seeing Through Paintings. (Yale Univerity Press, 2000)
Mayer, Ralph. The Artist's Handbook of Materials and Techniques, 5th ed. (Viking Press, 1991)