Sancti Thomae Aquinatis tractatus De unitate intellectus contra averroistas / Leo W. Keeler. - Thomas Aquinas, s., c. 1225-1274. (OLS)http://pul/name/3373; Keeler, Leo William, S.I., 1890-1937. (OLS)http://pul/name/54237; Pontificia Università Gregoriana. (OLS)http://pul/name/147 (Pont. Universitas Gregoriana, 1936)