Liber 6, Tractatus 4,1-15 - Ulrich : von Strassburg, <1225-1277>. (OLS)http://semarc/name/573; Sturlese, Loris, <1948- >. (OLS)http://semarc/name/137; Zavattero, Irene. (OLS)http://semarc/name/39470; Colomba, Coralba. (OLS)http://semarc/name/80914 (De summo bono, 2017)