King, David, and Steven Livesey. 1996. “On the Role of the Muezzin and the Muwaqqit in Medieval Islamic Society”. In Tradition, Transmission, Transformation: Proceedings of Two Conferences on Pre-Modern Science Held at the University of Oklahoma, eds. F. Jamil Ragep and Sally Ragep, 285-346. Leiden; New York: E. J. Brill.