Columbia subject headings:
Existentialism.
God (Islam)--Proof.
Qurʼan--Criticism, interpretation, etc.
Harvard subject headings:
Existentialism
God (Islam)--Proof
Qurʼan--Criticism, interpretation, etc.
Princeton subject headings:
Existentialism.
God (Islam)--Proof.
Qurʼan--Criticism, interpretation, etc.