Collectorium circa quattuor libros Sententiarum. - Biel, Gabriel. (OLS)http://ftis/name/68872; Steiger, Renata. (OLS)http://ftis/name/68876; Hofmann, Udo. (OLS)http://ftis/name/68874; Werbeck, Wilfridus. (OLS)http://ftis/name/66382 (J.C.B. Mohr,, 1975)