Koran, Koranic, Quran, Quranic
NG preferred spelling is Quran (exception to Merriam-Webster's).
Use Koran spelling only if preferred by a specific organization or in a title or name.
Set in roman.
Citations appear as follows:
In the Quran (XXXVII:20-44) it says...
Quran, Sura XLIX: 13