Howard Pollack, John e Rebecca Moores, George Gershwin. His Life and Work, University of California Press, 2006, p. 709, ISBN9780520248649. citazione: "many sources state that Gershwin was a Freemason—for example, Dan Brown's bestselling thriller, The Da Vinci Code (New York: Doubleday, 2003), p. 389—but his name has yet to turn up on any registry of Masons".
