"Chapter I – The German Military System". Handbook on German Military Forces. War Department. 15 March 1945. p. [I-57]. Technical Manual TM-E 30-451. Retrieved 14 August 2019 – via Hyperwar Foundation.
S. Miles, Aileen; L. Meyer, Alfred (eds.). "Information Bulletin February 1951". search.library.wisc.edu. Information Bulletin, Monthly Magazine of the Office of the U.S. High Commissioner for Germany (U.S. Department of State). p. 37. Retrieved 23 September 2024 – via University of Wisconsin–Madison.