XL Homiliarum in Evangelia : libri duo / Sancti Gregorii Magni. - Gregorius PP. I, Magnus, s., c. 540-604. (OLS)http://pul/name/1072; Hurter, Hugo, S.I., 1832-1914. (OLS)http://pul/name/14162 (libraria academica wagneriana, 1887)