Kahn, L. (1973). Ludwig Robert: Rahel's brother. Year Book / Leo Baeck Institute.
Cita Chicago (17th ed.)Kahn, Lothar. "Ludwig Robert: Rahel's Brother." Year Book / Leo Baeck Institute 1973.
Cita MLA (8th ed.)Kahn, Lothar. "Ludwig Robert: Rahel's Brother." Year Book / Leo Baeck Institute, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.