Kahn, L. (1973). Ludwig Robert: Rahel's brother. Year Book / Leo Baeck Institute.
Lua i Stíl Chicago (17ú heag.)Kahn, Lothar. "Ludwig Robert: Rahel's Brother." Year Book / Leo Baeck Institute 1973.
Lua MLA (8ú heag.)Kahn, Lothar. "Ludwig Robert: Rahel's Brother." Year Book / Leo Baeck Institute, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.