Venerabilis inceptoris Guillelmi de Ockham Scriptum in Librum primum sententiarum ordinatio. Prologus et distinctio prima / 
Saint Bonaventure College and Seminary (Saint Bonaventure). - Division of Graduate Studies. - Franciscan Institute.
Gál, Gedeon.
Brown, Stephano.
St. Bonaventure, 
1967-1970.