Robinson, David (1973). "Abdul Qadir and Shaykh Umar: A Continuing Tradition of Islamic Leadership in Futa Toro". The International Journal of African Historical Studies. 6 (2): 286–303. doi:10.2307/216779. ISSN0361-7882. JSTOR216779.
Robinson, David (1973). "Abdul Qadir and Shaykh Umar: A Continuing Tradition of Islamic Leadership in Futa Toro". The International Journal of African Historical Studies. 6 (2): 286–303. doi:10.2307/216779. ISSN0361-7882. JSTOR216779.
Robinson, David (1973). "Abdul Qadir and Shaykh Umar: A Continuing Tradition of Islamic Leadership in Futa Toro". The International Journal of African Historical Studies. 6 (2): 286–303. doi:10.2307/216779. ISSN0361-7882. JSTOR216779.