Jerzy Jan Lerski (auch: George J. Lerski), Historical Dictionary of Poland, 966-1945, ISBN 0-313-26007-9, Greenwood, Westport 1996, S. 456
wikipedia.org
en.wikipedia.org
Wojciech Materski, Katyn: A Crime Without Punishment (Yale University Press, 2007: ISBN 0-300-10851-6), p. 417.
Terry Martin, The Affirmative Action Empire: Nations and Nationalism in the Soviet Union, 1923-1939 (Cornell University Press, 2001: ISBN 0-8014-8677-7), p. 328.
