Froehlich E. Joseph Goebbels und sein Tagebuch («Fierteljahrshefte fur Zeitgeschichte», N 35, 1987, p. 522.
Fest J. Hitler. Eine Biographie. Paderborn: Schoningh, 1984, S. 881.
Weinberg G. German Diplomacy toward the Soviet Union (N. Naimark, A. Dallin, D. Holloway, S. Pursley [eds]. Operation Barbarossa. Salt Lake City, 1991, p. 330).
Foreign Relations of the United States (FRUS), 1941, v.I, p. 179–181.
Heinrichs W. Threshold of War: Franklin D. Roosevelt and American Entry in World War II. N.Y.: Oxford University Press, 1988, p.102.
Gaddis J. L. Russia, the Soviet Union, and the United States: An Interpretive History. N.Y.:McGrow Hill, 1990, p. 146–147.