Ein Gnostiker in der Novatianuskatakombe / Hans Lietzmann. - Lietzmann, Hans, 1875-1942. (OLS)http://pul/name/3387 (Akademie-Verlag, 1958)
IAR: CRA.85

The metaphysics of being of St. Thomas Aquinas in a historical perspective / by Leo J. Elders. - Elders, Leo J., S.V.D. (OLS)http://pul/name/409 (Brill, 1993)
Bibliografia in nota.