American Indian Contributions to the World, by Emory Dean Keoke and Kay Marie Porterfield. New York: Facts on File, 2003.
Towards a Navajo Geometry. Pinxten, R., Soberon, E., & van Dooren,I.(1987).Gent: KKI Publishers.
Native American Mathematics (Paperback) by Michael P. Closs
Ancient astronomy: an encyclopedia of cosmologies and myth By Clive L. N. Ruggles
Creating a Sacred Place for Students in Math NationalIndianSchoolBoards Association