E.A. Lane Poole, "The Date of the Crossing of the Zambezi by the Ngoni"Journal of the African Society, 29, 1929-30, pp.290-2; also Marwick, M.G., (1963). "History and Tradition in East Central Africa Through the Eyes of the Northern Rhodesian Cheŵa", Journal of African History, 4, 3, p.385.
