Columbia subject headings:
Agnosticism.
Belief and doubt.
God--Proof, Ontological--Bibliography.
God--Proof, Ontological.
Harvard subject headings:
Agnosticism.
Belief and doubt
God--Proof, Ontological
God--Proof, Ontological--Bibliography.
Princeton subject headings:
God--Proof, Ontological--Bibliography.
God--Proof, Ontological.