Steinberg, Leo. Who's who in Michelangelo's Creation of Adam: A Chronology of the Picture's Reluctant Self-Revelation // The Art Bulletin 74 (4). December 1992. DOI:10.2307/3045910. с. 553 – 554.
Sutherland, Bruce. Cameo Appearances on the Sistine Ceiling // Source: Notes in the History of Art 32 (2). University of Chicago Press, Winter 2013. с. 14. Alnwick Castle is in Northumberland, not Northampton, as the captions state. The Duke of Northumberland who owns the cameos discussed in the article has expressed his appreciation in a letter to the author.
