• Polish Ministry of Foreign Affairs (2014). The German Occupation of Poland. Washington, D.C.: Dale Street Books. pp. 10–28. ISBN 9781941656105.
• Judith Olsak-Glass (January 1999). "Review of Piotrowski's Poland's Holocaust". Sarmatian Review. The prisons, ghettos, internment, transit, labor and extermination camps, roundups, mass deportations, public executions, mobile killing units, death marches, deprivation, hunger, disease, and exposure all testify to the 'inhuman policies of both Hitler and Stalin' and 'were clearly aimed at the total extermination of Polish citizens, both Jews and Christians. Both regimes endorsed a systematic program of genocide.
• "Terminal horror suffered by so many millions of innocent Jewish, Slavic, and other European peoples as a result of this meeting of evil minds is an indelible stain on the history and integrity of Western civilization, with all of its humanitarian pretensions" (Note: "this meeting" refers to the most famous third (Zakopane) conference).

Conquest, Robert (1991). "Stalin: Breaker of Nations". New York, N.Y.: Viking. ISBN 0-670-84089-0

• Tadeusz Piotrowski (1997). Poland's Holocaust: Ethnic Strife, Collaboration with Occupying Forces and Genocide... McFarland & Company. p. 295. ISBN 0-7864-0371-3. See also review
• AFP/Expatica, Polish experts lower nation's WWII death toll, expatica.com, 30 August 2009
• Polska 1939–1945. Straty osobowe i ofiary represji pod dwiema okupacjami, ed. Tomasz Szarota and Wojciech Materski, Warszawa, IPN 2009, ISBN 978-83-7629-067-6 (Introduction reproduced here Archived 1 February 2013 at the Wayback Machine.)