Cox, R., Stewart, E. I., & Stewart, J. R. (1957). The Columbia River, or, Scenes and adventures during a residence of six years on the western side of the Rocky Mountains among various tribes of Indians hitherto unknown: Together with a journey across the American Continent. University of Oklahoma Press.

Cox, Ross, et al. The Columbia River, or, Scenes and Adventures During a Residence of Six Years on the Western Side of the Rocky Mountains Among Various Tribes of Indians Hitherto Unknown: Together with a Journey Across the American Continent. University of Oklahoma Press, 1957.