Não informado. (1954). Gems and minerals. California Federation of Mineralogical Societies and Other Mineralogical.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Gems and Minerals. Mentone, Calif: California Federation of Mineralogical Societies and Other Mineralogical, 1954.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Gems and Minerals. California Federation of Mineralogical Societies and Other Mineralogical, 1954.
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