Milliken, R., & Schwitalla, A. W. (2012). California and Great Basin olivella shell bead guide. Left Coast Press.
Lua i Stíl Chicago (17ú heag.)Milliken, Randall, agus Al W. Schwitalla. California and Great Basin Olivella Shell Bead Guide. Walnut Creek, CA: Left Coast Press, 2012.
Lua MLA (9ú heag.)Milliken, Randall, agus Al W. Schwitalla. California and Great Basin Olivella Shell Bead Guide. Left Coast Press, 2012.
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