Liber 3, Tractatus 1-3 - Ulrich : von Strassburg, <1225-1277>. (OLS)http://semarc/name/573; Tuzzo, Sabina. (OLS)http://semarc/name/54122; Sturlese, Loris, <1948- >. (OLS)http://semarc/name/137 (De summo bono, 2004)