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Piotr Semków, IPN Gdańsk (September 2006). "Kolebka (Cradle)"(PDF). IPN Bulletin No. 8–9 (67–68), 152 Pages. Warsaw, Poland: Instytut Pamięci Narodowej (Institute of National Remembrance). 42–50 (44–51/152 in PDF). ISSN1641-9561. Archived from the original(PDF) on 17 September 2018. Retrieved 8 November 2015 – via direct download: 3.44 MB.
Artur Hojan; Cameron Munro (2015). "Nazi Euthanasia Programme in Occupied Poland 1939-1945". Overview of the liquidation of the mentally ill during actions on the Polish territory (1939-1945). The Tiergartenstrasse 4 Association, international centre for the documentation, study and interpretation of Nazi crimes. Nazi Euthanasia in European Perspective conference, Berlin, Kleisthaus, Feb. 28-30, 2013. Retrieved 2 July 2015.
Piotr Semków, IPN Gdańsk (September 2006). "Kolebka (Cradle)"(PDF). IPN Bulletin No. 8–9 (67–68), 152 Pages. Warsaw, Poland: Instytut Pamięci Narodowej (Institute of National Remembrance). 42–50 (44–51/152 in PDF). ISSN1641-9561. Archived from the original(PDF) on 17 September 2018. Retrieved 8 November 2015 – via direct download: 3.44 MB.
Piotr Semków, IPN Gdańsk (September 2006). "Kolebka (Cradle)"(PDF). IPN Bulletin No. 8–9 (67–68), 152 Pages. Warsaw, Poland: Instytut Pamięci Narodowej (Institute of National Remembrance). 42–50 (44–51/152 in PDF). ISSN1641-9561. Archived from the original(PDF) on 17 September 2018. Retrieved 8 November 2015 – via direct download: 3.44 MB.