L. von Pastor: Geschichte der Päpste seit dem Ausgang des
Mittelalters. Band VI. 1913; VII. 1920. (Of these volumes of the
German, covering the years 1550-65, there is as yet no English
translation).
P. Herre: Papsttum und Papstwahl im Zeitalter Philipps, II. 1907.
J. McCabe: Crises in the History of the Papacy. 1916. (Popular).
Mandel Creighton: op. cit.
L. von Ranke: History of the popes, their church and state, in the
sixteenth and seventeenth centuries, translated from the German by
Sarah Austin. Vol. 1, 1841. (Translation of Ranke's Die römischen
Päpste, of which the first edition appeared 1834-6. A classic).
H. M. Vaughan: The Medici Popes. 1908. (Popular, sympathetic).
G. Droysen: Geschichte der Gegenreformation. 1893. (Oncken's
Series).
E. Rodocanachi: "La Réformation en Italic," Revue des Deux Mondes,
March, 1915.
Lord Acton: Lectures on Modern History, 1906, pp. 108 ff.
J. A. Symonds: The Catholic Reaction. 2 vols. 1887.