El-Cheikh 1999, p. 18. El-Cheikh, Nadia Maria (1999). "Muḥammad and Heraclius: A Study in Legitimacy". Studia Islamica. Maisonneuve & Larose. 62 (89): 5–21. ISSN0585-5292. Cite has empty unknown parameters: |month= dan |coauthors= (bantuan)
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El-Cheikh 1999, p. 18. El-Cheikh, Nadia Maria (1999). "Muḥammad and Heraclius: A Study in Legitimacy". Studia Islamica. Maisonneuve & Larose. 62 (89): 5–21. ISSN0585-5292. Cite has empty unknown parameters: |month= dan |coauthors= (bantuan)