Geschichte Italiens im Mittelalter - Hartmann, Ludo Moritz, 1865-1924 (G.H. Wingand, 1897)
Vol. 1. 1897 -- v. 2, 1. 1900 -- v. 2, 2. 1901 -- v. 3., 1. 1908 -- v. 3, 2. 1911 -- v. 4., 1. 1915.
Reissued with new title-pages as parts of the series "Geschichte der europäischen Staaten, hrsg. von A. H. L. Heeren, F. A. Ukert, W. v. Giesebrecht und K. Lamprecht," pub. by F. A. Perthes in Gotha, to whom the publication of the above work and its continuation were transferred. At head of title, v. 2, pt. 2-v. 3: Allgemeine Staatengeschichte, 1. Abt.
Vol. 2 pt. 2 and v. 3 pt. 2 are Xerox reprints, University Microfilms, 1965.