Piotr Eberhardt, Jan Owsinski, Ethnic groups and population changes in twentieth-century Central-Eastern Europe, M.E. Sharpe, 2003, ISBN 0-7656-0665-8, Google Print, p.27
Jerzy Borzęcki, The Soviet-Polish peace of 1921 and the creation of interwar Europe, Yale University Press, 2008, ISBN 0-300-12121-0, Google Print, p.10
