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Crone P. God’s Rule: Government and Islam. Columbia University Press; 2004.
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Crone P. Medieval Islamic Political Thought. Edinburgh University Press; 2005. https://uoelibrary.idm.oclc.org/login?url=http://www.jstor.org/stable/10.3366/j.ctt1r1z0k
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Crone P. Medieval Islamic Political Thought. Edinburgh University Press; 2004. https://exeter.primo.exlibrisgroup.com/discovery/fulldisplay?docid=alma991014361949707446&context=L&vid=44UOEX_INST:default
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Robinson CF. Islamic Historiography. Vol Themes in Islamic history. Cambridge University Press; 2003.
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McAuliffe JD. Encyclopaedia of the Qurʼān. Brill; 2001. https://uoelibrary.idm.oclc.org/login?url=http://www.brillonline.nl/browse/encyclopaedia-of-the-quran
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The Encyclopaedia of Islam. New edition. E.J. Brill; 1960. https://exeter.primo.exlibrisgroup.com/discovery/fulldisplay?docid=alma991006461759707446&context=L&vid=44UOEX_INST:default
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The Encyclopædia Iranica. http://www.iranicaonline.org/
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JSTOR journal archive. https://uoelibrary.idm.oclc.org/login?url=http://www.jstor.org/
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www.alwaraq.net. http://www.alwaraq.net/Core/index.jsp?option=1
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DIN 31635 - Wikipedia, the free encyclopedia. https://en.wikipedia.org/wiki/DIN_31635
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Richard Bulliet - History of the World to 1500 CE (Session 1) - Introduction to World History. Published online 11AD. https://www.youtube.com/watch?v=r_w7pfulsn8
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Bridging World History. http://www.learner.org/courses/worldhistory/
