Khalifah zuhud Umar bin Abdul Aziz - Al-Banjari Al-Makki, Muhammad Nuruddin Marbu 1960-; Mohammad Subki Abdul Rahman 1968 (Shah Alam, Selangor PSN Publications, 2012)
Keywords: Muhammad -- Prophet -- d. 632 -- Companions; Umar II -- Caliph -- d. 720; Caliphs -- Biography