https://mappingthelives.org/bio/fd9be59e-25c2-4bff-b71a-a5ddd34be82b?language=en
https://www.jewishgen.org/yizkor/nuremberg/nur006.html
https://www.steinburger-geschichte.de/themen/nationalsozialismus/der-zweite-weltkrieg-im-kreis-steinburg/opfer-des-nationalsozialismus-juedinnen-und-juden
His story as told by himself: http://www.akens.org/akens/texte/info/29/3.html
Rolf William Halsted Hallenstein (deceased) - Genealogy
Rolf William Hallenstein - Ancestry®
HALLENSTEIN Rolf Germany: The Leeds Database
Rolf William Hallenstein (1912-2005) - Find a Grave Memorial