1. Spear T. T. 1974 The Kaya complex: A history of the Mijikenda peoples of the Kenya coast to 1900. University of Wisconsin, Ph.D. dissertation.
2. Ranger T. O. 1966 ‘Witchcraft eradication movements in Central and Southern Tanzania and their connection with the Maji Maji Rising,’ Unpublished MS, University College, Dar es Salaam.
3. Ranger T. O. n. d. ‘Mchape and the study of witchcraft eradication.’ Unpublished MS.