Karl Jaspers : an introduction to his philosophy / by Charles F. Wallraff. - Wallraf, Charles F. (OLS)http://pul/name/43706 (University Press, 1970)
Bibliografia: p. 215-219.

De gratia Redemptoris / H. Lennerz S.I. - Lennerz, Heinrich, S.I. (OLS)http://pul/name/10792; Pontificia Università Gregoriana. (OLS)http://pul/name/147 (P. Universitas Gregoriana, 1940)
In testa al front.: Pontificia Universitas Gregoriana.
Bibliografia: p. 389-394.