1. A. N. Zolikman, O. E. Krein, and G. V. Samsov:Metallurgy of Rare Metals, 2nd ed., Israel Program Scientific Translations, Jerusalem, 1966. p. 435.
2. Khalil Afgouni and J.H. Silva:Lithium Ore in Brazil, Arqueana de Minerios e Metais Ltda. Rua Maria Figueiredo, 374, Paraiso, 044002-S. Paulo, 1978, pp. 1–13.
3. Anuario Mineral Brasileiro, published by the National Department of Mineral Production, The Ministry of Mines and Minerals, Brazil, 1980, pp. 269–76.