US House of Representatives, 80th Congress, Special Session, Committee on Un-American Activities, Report on Soviet Espionage Activities in Connection with the Atom Bomb, September 28, 1948 (US Gov. Printing Office).
US House of Representatives, 80th Congress, Special Session, Committee on Un-American Activities, Report on Soviet Espionage Activities in Connection with the Atom Bomb, ngày 28 tháng 9 năm 1948 (US Gov. Printing Office) pp. 181, 182.