Não informado. (1948). Mineral Information Service. California Division of Mines and Geology.
Chicago-viite (17. p.)Não informado. Mineral Information Service. Sacramento, Calif: California Division of Mines and Geology, 1948.
MLA-viite (8. p.)Não informado. Mineral Information Service. California Division of Mines and Geology, 1948.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.