New York, 12 March 1956 - Institutional correspondence Bernard Karpel's letter to Willem Sandberg, dated 12 March 1956
New York, 27 November 1956 - Institutional correspondence Bernard Karpel's letter to Willem Sandberg, dated 27 November 1956
Department of the Army, Washington D.C., March 14, 1970 - Government report Report of the Department of the Army Review of the Preliminary Investigations into the My Lai Incident