Habermann, J. (1998). Kaufmann Kohler and his teacher Samson Raphael Hirsch. Year Book / Leo Baeck Institute.
Chicago-referens (17:e uppl.)Habermann, Jacob. "Kaufmann Kohler and His Teacher Samson Raphael Hirsch." Year Book / Leo Baeck Institute 1998.
MLA-referens (8:e uppl.)Habermann, Jacob. "Kaufmann Kohler and His Teacher Samson Raphael Hirsch." Year Book / Leo Baeck Institute, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.