Are the Muslim sources historically accurate?
Biography of Muhammad (Sira literature) : The Quest of the Historical Muhammad
Muslim traditions (hadith) : A Revaluation of Islamic Traditions
Discrepancies between statements in the Qur'an and known history :
Jesus was not crucified?
and more under the
Historical Quran Contradictions
The Sources of the stories and ideas found in the Qur'an : Sources of the Qur'an
The development and textual transmission of the Qur'an : The Text of the Qur'an