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Montgomery Watt, W. (1977). „Muhammad”. The Cambridge History of Islam: Volume Undefined: The Central Islamic Lands from Pre-Islamic Times to the First World War. The Cambridge History of Islam. Cambridge University Press: 45. ISBN9781139055024. doi:10.1017/CHOL9780521219464.004. Приступљено 31. 1. 2021.
Montgomery Watt, W. (1977). „Muhammad”. The Cambridge History of Islam: Volume Undefined: The Central Islamic Lands from Pre-Islamic Times to the First World War. The Cambridge History of Islam. Cambridge University Press: 39. ISBN9781139055024. doi:10.1017/CHOL9780521219464.004. Приступљено 31. 1. 2021.
Montgomery Watt, W. (1977). „Muhammad”. The Cambridge History of Islam: Volume Undefined: The Central Islamic Lands from Pre-Islamic Times to the First World War. The Cambridge History of Islam. Cambridge University Press: 45. ISBN9781139055024. doi:10.1017/CHOL9780521219464.004. Приступљено 31. 1. 2021.
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