The Association of Israelis of Central European Origin
Leo Baeck Jerusalem Institute for the study of German Jewry
Leo Baeck New York: German-Jewish History Online
Robert Weltsch and Kurt Loewenstein Correspondence
Judische Rundschau (Berlin till 1938)
Thomas-Mann-Archiv der ETH Zurich
Miriam and Hanna Loewenstein Berlin (1937) photo: Herbert Sonnenfeld collection, Yad Vashem Archives