Sipowicz, Kasper, and Tadeusz Pietras. “Life Unworthy of Life – Eugenics of ‘deteriorated’ People in the Third Reich”. Quarterly Journal Fides et Ratio 39, no. 3 (September 30, 2019): 312–324. Accessed August 14, 2025. https://fidesetratio.com.pl/ojs/index.php/FetR/article/view/107.