Columbia subject headings:
Metaphysics.
Ontology.
Thomas, Aquinas, Saint, 1225?-1274.
Harvard subject headings:
Aristotle. Metaphysics
Metaphysics--Early works to 1800
Thomas, Aquinas, Saint, 1225?-1274. In duodecim libros Metaphysicorum Aristotelis expositio
Princeton subject headings:
Metaphysics.
Ontology.
Thomas, Aquinas, Saint, 1225?-1274--Criticism and interpretation.
Thomas, Aquinas, Saint, 1225?-1274.