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Beck, Horace (1928) "Classification and Nomenclature of Beads and Pendants." Archaeologia 77. (Reprinted by Shumway Publishers York, PA 1981)

Dubin, Lois Sherr. North American Indian Jewelry and Adornment: From Prehistory to the Present. New York: Harry N. Abrams, 1999: 170-171. .

Dubin, Lois Sherr. The History of Beads: From 100,000 B.C. to the Present, Revised and Expanded Edition. New York: Harry N. Abrams, (2009). .