Gnecchi, F. I Medaglioni Romani. (Milan, 1912).
574 pages, 162 plates, 4 volumes, large format. Italian language. Standard and the ONLY reference on Roman medallions in all metals. Does not cover provincial issues.
Vol. I: Gold and Silver Medals, lxviii, 84 pages
Vol. II: Bronze Medals, 159 pages
Vol. III: Bronze Medals, 234 pages
Vol. IV: 162 plates.