PRM - Council of Ministers (Cabinet Office). 1939 - 1991. PRM Council of Ministers (Cabinet Office). Archive of the Prime Minister 1939 - 1945.
Polish-Soviet relations. Question of the missing Polish officers in the USSR, 1944 Part 1 PRM – Council of Ministers (Cabinet Office). 1939 – 1991. PRM Council of Ministers (Cabinet Office). Archive of the Prime Minister 1939 – 1945.