Der Aufbau der realen Welt : Grundriss der allgemeinen Kategorienlehre / von Nicolai Hartmann. - Hartmann, Nicolai, 1882-1950. (OLS)http://pul/name/10737 (Walter De Gruyter & Co., 1964)
Bibliografia in nota.

Freedom and order : graduate essays on the role of liberty in political liberty / introduction by Gloria L. Zúñiga. - Zúñiga, Gloria L. (OLS)http://pul/name/52826 (Action Institute for the Study of Religion and Liberty, 1997)