Friedman, I. (1979). The Hilfsverein der deutschen Juden, the German foreign ministry and the controversy with the zionists, 1901-1918. Year Book / Leo Baeck Institute.

Friedman, Isaiah. "The Hilfsverein Der Deutschen Juden, the German Foreign Ministry and the Controversy with the Zionists, 1901-1918." Year Book / Leo Baeck Institute 1979.

Friedman, Isaiah. "The Hilfsverein Der Deutschen Juden, the German Foreign Ministry and the Controversy with the Zionists, 1901-1918." Year Book / Leo Baeck Institute, 1979.