Heizer, R. F.; Treganza, A. E. (December 1971), "Mines and quarries of the Indians of California", The California Indians, University of California Press, pp. 346–359, doi:10.1525/9780520340497-029
jstor.org
Basgall, Mark E. (Summer 1979), "To Trade, or Not to Trade: a Pomo Example", Journal of California and Great Basin Anthropology, 1 (1): 178–182, JSTOR27824954