^Trial of German Major War Criminals, vol. 3, pp. 376–377. Italics in the original
^Tobias R. Philbin III:The Lure of Neptune: German-Soviet Naval Collaboration and Ambitions, 1919-1941 ISBN 978-0-87249-992-8
^William L. Shirer:The Rise and Fall of the Third Reich: A History of Nazi Germany ISBN 978-0-671-72868-7
^Nekrich, A. M. (Aleksandr Moiseevich):Pariahs, partners, predators:German-Soviet relations, 1922-1941 ISBN 978-0-231-10676-4, page 203
^Donaldson, Robert H. and Joseph L. Nogee, The Foreign Policy of Russia: Changing Systems, Enduring Interests, M.E. Sharpe, 2005, ISBN 978-0-7656-1568-8, pages 65-66
^Churchill, Winston, The Second World War, Houghton Mifflin Harcourt, 1953, ISBN 978-0-395-41056-1, pages 520-21