Não informado. (1948). Mineral Information Service. California Division of Mines and Geology.
Chicago-referens (17:e uppl.)Não informado. Mineral Information Service. Sacramento, Calif: California Division of Mines and Geology, 1948.
MLA-referens (8:e uppl.)Não informado. Mineral Information Service. California Division of Mines and Geology, 1948.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.