Die Malerei und Plastik des Mittelalters in Italien - Vitzthum von Eckstädt, Georg, Graf, 1880- (Akademische Verlagsgesellschaft Athenaion, 1924)
Issued in 8 parts, 1914-25.
The general introduction on medieval art and the chapters on early medieval painting and sculpture (p. 1-113) are by Vitzthum ; the chapters on late medieval sculpture and painting (p. 114-332) by Volbach.