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^ abcdefghijPaul Frölich, "Ernst Meyer," Revolutionary Age [New York], vol. 1, no. 9 (March 1, 1930), pp. 12-13.
^ abEric Waldman, The Spartacist Uprising. Milwaukee, WI: Marquette University Press, 1958; pg. 51.
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"The Decline, Disorientation and Decomposition of a Leadership: The German Communist Party: From Revolutionary Marxism to Centrism," Revolutionary History, Vol. 2 No. 3 (Autumn 1989). Part 1. || Part 2.