Columbia subject headings:
Qurʼan--Criticism, Textual.
Qurʼan--Language, style.
Qurʼan--Orthography.
Harvard subject headings:
Qurʼan--Criticism, Textual.
Qurʼan--Language, style.
Qurʼan--Orthography.
Princeton subject headings:
Qurʼan--Criticism, interpretation, etc.