|El-Cheikh, Nadia Maria Byzantium Viewed by the Arabs 2004, Harvard University Press p|
|Hitti, History of the Arabs, 10th edition 1970 , p||5, "One major challenge to examining initial contacts between Byzantium and the early Muslim umma arises from the controversy surrounding the traditional Islamic account|
Denis Gril, Miracles, , Brill, 2007.
|"Muhmmad," Encyclopedia of Islam and the Muslim world• Kafih Jerusalem, 1984 , ch|
|137 Netanel's work was virtually unknown beyond his native Yemen until modern times, so had little influence on later Jewish thought• sources are not contemporaneous with the events they purport to relate and sometimes were written many centuries later||Ideally, one would like to be able to check such accounts against contemporary evidence|