"The most sensational art trial of the early twentieth century", according to John Brewer, "Art and Science: A Da Vinci Detective Story", Engineering and Science, No. 1/2 (2005); Brewer's The American Leonardo: A Tale of Obsession, Art and Money (New York: Oxford UP, 2009) is the definitive account of the Hahns' unsuccessful marketing of their painting.
"Duveen on Da Vinci". Time.com. 1929-02-18. Archived from the original on November 28, 2007. Retrieved 2013-07-22. (subscription required for full view)
web.archive.org
"Duveen on Da Vinci". Time.com. 1929-02-18. Archived from the original on November 28, 2007. Retrieved 2013-07-22. (subscription required for full view)
