Williams 2013, pp. 197, 256–68, 318. Williams, Mason B. (2013). City of Ambition: FDR, La Guardia, and the Making of Modern New York. New York: W.W. Norton. ISBN978-0-393-06691-3.. online
Williams 2013. Williams, Mason B. (2013). City of Ambition: FDR, La Guardia, and the Making of Modern New York. New York: W.W. Norton. ISBN978-0-393-06691-3.. online
David M. Esposito, and Jackie R. Esposito, "La Guardia and the Nazis, 1933–1938." American Jewish History 1988 78(1): 38–53. ISSN0164-0178; quote from H. Paul Jeffers, The Napoleon of New York (2002) p. 233.