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H. Thode: Michelangelo und das Ende der Renaissance. 5 vols. 1902-13.
L. Dorez: "Nouvelles recherches sur Michel-Ange et son entourage," Bibliothèque de l' École des Chartes. Vol. 77, pp. 448 ff. (1916), vol. 78, pp. 179 ff. (1917).
Romain Roland: Vie de Michel-Ange.[4] 1913.
The Sonnets of Michael Angela Buonarroti, translated into English by J. A. Symonds. (My copy, Venice, has no date).
R. W. Emerson: Essay on Michaelangelo.
A. Dürer's Schriftliche Nachlass, ed. E. Heidrich. 1908.
M. Thausing: A. Dürer.[2] 1876. (English translation from 1st ed. by F. A. Eaton. 1882).
Albrecht Dürers Niederländische Reise, hg. van J. Veth und S. Müller. 2 vols. 1918.
A. B. Chamberlain: Hans Holbein the Younger. 2 vols. 1913.