Scharfe, Patrick. "Portrayals of the Later Abbasid Caliphs: The Role of the Caliphate in Buyid and Saljūq-era Chronicles, 936-1180." Master's thesis, Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275506456Chicago Manual of Style (17th edition)