Analysis of information sources in references of the Wikipedia article "The Holocaust in Bulgaria" in English language version.
Chief of the General Staff of the Bulgarian army – Order 656/24.01.1941 "Cancellation of mobilization assignment of Jewish descendants and their replacement with Bulgarians
Sofia, 5 March 1941: Report 3633 from the Director of Civilian Mobilization to the Council of Ministers with a proposal for the inclusion of Jews to be mobilized into working groups under the "Labor Force".