Gianfalco : storia e vita / Alberto Viviani. - Viviani, Alberto, 1894- (OLS)http://pul/name/37089 (G. Barbèra, 1934)

The ars grammatica of Julian of Toledo / Charles H. Beeson. - Beeson, Charles H. (Charles Henry), 1870-1949. (OLS)http://pul/name/6241 (Biblioteca apostolica vaticana, 1924)
IAR: CLA.29