Robson, J. A. (1961). Wyclif and the Oxford schools: The relation of the "Summa de ente" to scholastic debates at Oxford in the later fourteenth century. Cambridge: University Press.

Robson, John Adam. Wyclif and the Oxford Schools: The Relation of the "Summa De Ente" to Scholastic Debates At Oxford in the Later Fourteenth Century. Cambridge: University Press, 1961.

Robson, John Adam. Wyclif and the Oxford Schools: The Relation of the "Summa De Ente" to Scholastic Debates At Oxford in the Later Fourteenth Century. Cambridge: University Press, 1961.