David Welch, Propaganda and the German Cinema, 1933–1945, Oxford: Oxford University-Clarendon, 1983, ISBN978-0-19-822598-0, p. 320 (rev. ed. 2001, p. 275).
Rolf Giesen, Nazi Propaganda Films: A History and Filmography, Jefferson, North Carolina/London: McFarland, 2003, ISBN978-0-7864-1556-4, p. 227.