Ludwig Louie Traubel (1895 - c.1942) - Genealogy (geni.com)
Central DB of Shoah Victims’ Names - Record Details (yadvashem.org)
Holocaust Survivors and Victims Database – Ludwig TRAUBEL (ushmm.org)
Gedenkbuch - Memorial book entry (bundesarchiv.de)
https://www.mappingthelives.org/bio/72b8acb6-cf6d-4f8c-8bdd-1e073629b21c
https://www.alemannia-judaica.de/oberaltertheim_synagoge.htm