L. Pastor: History of the Popes from the close of the Middle Ages. English translation,[2] vols. 1-6 edited by Antrobus, vols. 7-12 edited by R. Kerr. 1899 ff. (Exhaustive, brilliantly written, Catholic, a little one-sided).
Mandel Creighton: A History of the Papacy 1378-1527. 6 vols. 1892 ff. (Good, but in large part superseded by Pastor).
F. Gregorovius: A History of Rome in the Middle Ages, translated by
A. Hamilton. vols 7 and 8. 1900. (Brilliant).
Schaff's History of the Christian Church. Vol. 5, part 2. The Middle Ages. 1294-1517, by D. S. Schaff. 1910. (A scholarly summary, warmly Protestant).
J. Schnitzer: Quellen und Forschungen zur Geschichte Savonarolas. 3 vols. 1902-4.
J. Schnitzer: Savonarola im Streite mit seinem Orden und seinem
Kloster. 1914.
H. Lucas: Fra Girolamo Savonarola.[2] 1906.
H. C. Lea: An Historical Sketch of Sacerdotal Celibacy.[3] 2 vols. 1907. (Lea's valuable works evince a marvelously wide reading in the sources, but are slightly marred by an insufficient use of modern scholarship).
H. C. Lea: A History of Auricular Confession and Indulgences in the
Latin Church. 3 vols. 1896.
Aloys Schulte: Die Fugger in Rom, 1495-1523. 2 vols. Leipzig. 1904. (Describes the financial methods of the church. The second volume consists of documents).