Richard Albrecht (January 2005). "Dreipfeil gegen Hakenkreuz" – Symbolkrieg in Deutschland 1932("Three Arrows Against the Swastika" – symbol war in Germany 1932". Historical Case-Study in Anti-Nazi-Propaganda Within Germany and Western Europe, 1931-35).
books.google.com
Andreas Linhardt (2006). Die Technische Nothilfe in der Weimarer Republik. Dissertation: Braunschweig University of Technology. p. 667. ISBN 978-3-8334-4889-8. Retrieved 6 August 2011 ‹See Tfd›(in German).
"Die Eiserne Front"Archivado el 7 de octubre de 2011 en Wayback Machine.. Archived 7 October 2011 at the Wayback Machine Bundesverband Reichbanner Schwarz-Rot-Gold, Bund Aktiver Demokraten e. V. Retrieved 6 August 2011 ‹See Tfd›(in German).
web.archive.org
"Die Eiserne Front"Archivado el 7 de octubre de 2011 en Wayback Machine.. Archived 7 October 2011 at the Wayback Machine Bundesverband Reichbanner Schwarz-Rot-Gold, Bund Aktiver Demokraten e. V. Retrieved 6 August 2011 ‹See Tfd›(in German).