Quadri, Y. A. “THE HAMĀHULLĀH GROUP, A SUB-TIJĀNIYYAH MOVEMENT AND ITS TRACES IN NIGERIA ”. Islamic Studies, Vol. 24, no. 02, June 1985, pp. 205-13, http://irigs.iiu.edu.pk:64447/ojs/index.php/islamicstudies/article/view/5845.