Haikal, H. M. (1994). Khalifah Rasulullah Abubakar Ash-Shiddiq. Saint Joseph's University.
Chicago Style (17th ed.) CitationHaikal, Husein Muhammad. Khalifah Rasulullah Abubakar Ash-Shiddiq. Saint Joseph's University, 1994.
MLA (8th ed.) CitationHaikal, Husein Muhammad. Khalifah Rasulullah Abubakar Ash-Shiddiq. Saint Joseph's University, 1994.
Warning: These citations may not always be 100% accurate.