Toynbee, J., The Art of the Romans, London, 1965; McKendrick, P., Roman France, London, 1971; Romans and Barbarians, Boston Museum of Fine Arts, Boston, 1977; Vermeule, C., Greek and Roman Sculpture in America, California, 1981; Richter, G. M. A., Roman Portraits, New York, 1948; Kippers, H., Civilisations Romaine de la Moselle à la Sarre, Paris, 1983; Orfèvrerie Gallo-Romaine: Le Trésor de Rethel, Paris, 1988; and fourteen others of similar interest (21)