Caspar, R. (1998). A historical introduction to Islamic theology: Muhammad and the classical period. Pontificio Istituto di Studi Arabi e d'Islamistica.
Cita Chicago Style (17a ed.)Caspar, Robert. A Historical Introduction to Islamic Theology: Muhammad and the Classical Period. Rome: Pontificio Istituto di Studi Arabi e d'Islamistica, 1998.
Cita MLA (9a ed.)Caspar, Robert. A Historical Introduction to Islamic Theology: Muhammad and the Classical Period. Pontificio Istituto di Studi Arabi e d'Islamistica, 1998.
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