(1) In listing the sources and references, I followed these conventions: (a) The definite article *al-* was disregarded for alphabetization. (b) This index includes all works cited in the footnotes, whether printed or in manuscript. (c) The index is arranged according to the Arabic alphabet (*alif*, *bā’*, *tā’*, etc.). I began with the Noble Quran, the speech of Allah and the most exalted of all books. (d) The symbol (=) means “see.”