“Report on Atomic Espionage (Nelson-Weinberg and Hiskey-Adams Cases),” 29 September 1949, U.S. Congress, House of Representatives, Committee on Un-American Activities, 89th Cong., 1st sess., 1–15.
San Francisco FBI report of 1 July 1945 through 15 March 1947, Comintern Apparatus file, serial 5421.
Oral transcription of interview between Lt. Col. John Landsdale, Jr., and Dr. J. Robert Oppenheimer, 12 September 1943