Roger Manvell, Heinrich Fraenkel, Heinrich Himmler: The SS, Gestapo, His Life and Career, Skyhorse Publishing Inc., 2007, ISBN 1-60239-178-5, Google Print, p.76
Michael Alfred Peszke, Polish Underground Army, the Western Allies, and the Failure of Strategic Unity in World War II, McFarland & Company, 2004, ISBN 0-7864-2009-X, Google Print, p.2