[1b] L. A. SÉDILLOT, _Histoire générale des Arabes_.
2[c] The _Koran_.
3[d] E. GIBBON, _The Decline and Fall of the Roman Empire_.
4[e] SIR WILLIAM MUIR, _The Life of Mahomet_.
5[f] GEORG WEBER, _Weltgeschichte_.
6[g] IBN SAAD, _Sirat_ or _Biography of Mohammed_.
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