Abdul Rani Mustaffa, Abu Bakar as-Siddiq : pentadbir gemilang - vi, 137 pages ; 22 cm - Siri empat khalifah . - Siri empat khalifah . ISBN: 9838520543 ; 9789838520546 Subjects--Topical Terms: Abu Bakar as-Siddiq, Caliph Dewey Class. No.: 297.648