/u/mrhumphries75 and /u/y_sengaku offered recommendations in February of this year, with links to other relevant discussions.

Look at the sources cited by /u/frogbrooks in answer to this question about Islam's spread. /u/CptBuck also talked about jizya,which is the tax levied on Jews and Christians, aka "People of the Book" aka هل الكتاب‎

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You may be interested in the subreddit's booklist.