The Royal Air Force SIB case files now kept at the British National Archives in Kew, London, were the primary source of information for Human Game. Files specifically referred to and quoted in the text can be found catalogued in the following folders:
Air 40/2272: Progress reports in respect to Stalag Luft III investigation: results of effort to trace wanted German personnel. September 1945 through August 1947.
Air 40/2278: Murder of [Flight Lieutenant] Hayter and interrogation of associated German personnel.
Air 40/2279: The Kiel murders: enquiries and interrogation of persons involved. September 1945 through January 1947.
Air 40/2286: Reports on action taken in the British Zone to trace Germans wanted for interrogation. September 1945 through August 1946.
Air 40/2287: Reports on action taken to trace Germans wanted for interrogation. January 1946 through December 1946.
Air 40/2487: General papers (Sagan Memorial Book and suspect statements).
Air 40/2488: Progress reports, nos. 1–60. 1945.
Air 40/2489: Progress reports, nos. 61–120. 1946.
Air 40/2490: Progress reports, nos. 121–180. 1945.
Air 40/2491: Progress reports, nos. 181–240. 1946.
Air 40/2492: Progress reports, nos. 241–300. 1946.
Air 40/2493: Progress reports, nos. 301–368. 1946.
FO (Foreign Office) 371/57595: Sagan murder case: interrogation of Dr. Scharpwinkel in Moscow.
Cab 66/56/4: The Committing of Acts of Violence Towards British Prisoners of War. Memorandum by the Secretary of State for War.