Urban, M. (2009). Towards what Kind of Unity?: David Koigen, Leo Baeck and the Monism-Theism-Debate. Year Book / Leo Baeck Institute.
Lua i Stíl Chicago (17ú heag.)Urban, Martina. "Towards What Kind of Unity?: David Koigen, Leo Baeck and the Monism-Theism-Debate." Year Book / Leo Baeck Institute 2009.
Lua MLA (8ú heag.)Urban, Martina. "Towards What Kind of Unity?: David Koigen, Leo Baeck and the Monism-Theism-Debate." Year Book / Leo Baeck Institute, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.