*[http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/abudawud/ Sunan Abu-Dawud (Hadith collection) online in English]
*[http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/abudawud/ Sunan Abu-Dawud (Hadith collection) online in English]
*[http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/muwatta/ Malik's Muwatta (Hadith collection) online in English]
*[http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/muwatta/ Malik's Muwatta (Hadith collection) online in English]
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* Congressional Research Service, "Islam: A Primer", Report for Congress (2003), a work in the public domain and the source of part of this article [http://www.history.navy.mil/library/online/islam.htm#back] </ref>
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* Congressional Research Service, "Islam: A Primer", Report for Congress (2003), a work in the public domain and the source of part of this article [http://www.history.navy.mil/library/online/islam.htm#back]