Não informado. (1954). Gems and minerals. California Federation of Mineralogical Societies and Other Mineralogical.
Chicago-referens (17:e uppl.)Não informado. Gems and Minerals. Mentone, Calif: California Federation of Mineralogical Societies and Other Mineralogical, 1954.
MLA-referens (8:e uppl.)Não informado. Gems and Minerals. California Federation of Mineralogical Societies and Other Mineralogical, 1954.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.