** {{Cite book |last=Boghardt |first=Thomas |url=https://history.army.mil/html/books/045/45-5/cmhPub_45-5.pdf |title=Covert Legions - U.S. Army Intelligence in Germany, 1944-1949 |publisher=[[U.S. Army Center of Military History]] |year=2023 |isbn=978-3110999259}}