Collectorium circa quattuor libros Sententiarum. - Biel, Gabriel. (OLS)http://ftis/name/68872; Werbeck, Wilfridus. (OLS)http://ftis/name/66382; Steiger, Renata. (OLS)http://ftis/name/68876; Sievers, Volker. (OLS)http://ftis/name/68877; Hofmann, Udo. (OLS)http://ftis/name/68874 (J.C.B. Mohr,, 1984)