1. Bancroft, P. 1984. Gem and crystal treasures. Tucson, AZ: Western Enterprises and the Mineralogical Record, Inc.
2. The Ribaue — Alto Ligonha Pegmatite District, Portuguese East Africa
3. Mineral-Beobachtungen an der Kleinen Spitzkopje (SW-Afrika);Beyer H.;Der Aufschluss,1980
4. Famous mineral localities: Klein Spitzkoppe, Namibia;Cairncross B.;Mineralogical Record,2005
5. Mineral news from southern Africa;Cairncross B.;Australian Journal of Mineralogy,2005