1. British international standard (BIS). (1990). Specification for industrial minerals.
2. Black, R., Caby, R. and Moussine-Pochkine, A. (1979). Evidence for Late Precambrian Plate Tectonics in West-Africa. Nature 278: 223-226.
3. Bureau of Indian Standards (2007). Potash Feldspar and Soda Feldspar for Glass and Ceramic Industry-Specification. First revision.
4. Burke, K. C and Dewey, J. F (1972). Orogeny in Africa. In: Africa Geology (Dessauvagies, T. F. J and Whiteman, A. J., (Eds.). university of Ibadan, 1970: 583-608.
5. Cerny, P, Trueman, D. L., Zaehlke, D. V., Goad, B.E. and Paul, B.J. (1981). Catlake-Winnipeg River and the Wekusko Lake Pegmatite Fields, Manitoba. Energy and Mines, Economic Geology. Vol.80, 216-219.