Ernst Steinmann. "Die Sixtinische Capelle," 1905, Bruckmann, Munich, vol. ii (for the iconography of Michael Angelo and Vittoria Colonna).
Henry Thode. "Michelangelo und das Ende der Renaissance," vol. i, Grote, Berlin, 1902; vol. ii, the same, 1903. This notable work—still unfinished—is the most important psychological and philosophical study on Michael Angelo and his times which has yet been published. It is permissible to regret—without speaking of its Wagnerian tendency, which is vexatious and fantastic—an abuse of abstract categories and scholastic divisions, which, instead of throwing light on the subject, obscure it and add to the disorder of a too compact text. But these books are full of ideas, and form an extremely valuable storehouse of documents. I have abundantly drawn from them, as well as from the admirable editions and studies of Carl Prey.
III. Vittoria Colonna
"Carteggio," published by Erm. Ferrero and Gius. Müller, Torchi, Turin, 1892. A collection of letters from or to Vittoria Colonna, and documents relating to her life—among others, the " Vita di V. C," by Filonico Alicarnasseo.
"Lettere inedite," Salza edition, Florence, 1898.
"II codice delle rime di V. C. appartenente a Margherita, regina di Navarra," scoperto ed illustrato da D. Tordi, Pistoie, 1900.
Henry Roscoe. "V. C., her Life and Poems," London, 1868.
