"Deaf People in Hitler's Europe" by Donna Ryan and John Schuchman. Source: https://www.ushmm.org/research/publications/academic-publications/full-list-of-academic-publications/deaf-people-in-hitlers-europe
"What happened to deaf people during the Holocaust?" by Hugh Stiles, November 16, 2012. Source: https://blogs.ucl.ac.uk/library-rnid/2012/11/16/what-happened-to-deaf-people-during-the-holocaust/
"Testimonies of Deaf Holocaust Survivors" Oct. 28, 2007. Source: https://swarthmorephoenix.com/2007/10/28/testimonies-of-deaf-holocaust-survivors/
"The Deaf Holocaust: Deaf People in Nazi Germany" by BBC SeeHear. Source: http://www.johndclare.net/Nazi_Germany3_deafholocaust.htm
Related topics: eugenics.