Hai Gaon (1921), "Hai Gaon's Commentary on Seder Taharot", in Epstein, J.N. (ed.), The Geonic Commentary on Seder Taharot - Attributed to Rabbi Hai Gaon (in Hebrew), vol. 1, Berlin: Itzkowski, p. 19 (Keilim 10:2), OCLC13977130 (Available online, at HebrewBooks.org: The Geonic Commentary on Seder Taharot - vol. 1
Fontana, Bernard L.; Robinson, William J.; Cormack, Charles W.; Leavitt, Earnest E. (1962). Papago Indian Pottery. Seattle, Washington: University of Washington Press, on behalf of the American Ethnological Society. p. 57. OCLC869680.
Hai Gaon (1921), "Hai Gaon's Commentary on Seder Taharot", in Epstein, J.N. (ed.), The Geonic Commentary on Seder Taharot - Attributed to Rabbi Hai Gaon (in Hebrew), vol. 1, Berlin: Itzkowski, p. 19 (Keilim 10:2), OCLC13977130 (Available online, at HebrewBooks.org: The Geonic Commentary on Seder Taharot - vol. 1