Urban, M. (2009). Towards what Kind of Unity?: David Koigen, Leo Baeck and the Monism-Theism-Debate. Year Book / Leo Baeck Institute.
Chicago-referens (17:e uppl.)Urban, Martina. "Towards What Kind of Unity?: David Koigen, Leo Baeck and the Monism-Theism-Debate." Year Book / Leo Baeck Institute 2009.
MLA-referens (8:e uppl.)Urban, Martina. "Towards What Kind of Unity?: David Koigen, Leo Baeck and the Monism-Theism-Debate." Year Book / Leo Baeck Institute, 2009.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.