Ṭabarī, 8., & Humphreys, R. S. (1990). The crisis of the early caliphate. State University of New York Press.

Ṭabarī, 838?-923, and R. Stephen Humphreys. The Crisis of the Early Caliphate. Albany, N.Y.: State University of New York Press, 1990.

Ṭabarī, 838?-923, and R. Stephen Humphreys. The Crisis of the Early Caliphate. State University of New York Press, 1990.