"Ethics of Social-Democracy," by Joseph Dietzgen, Source: Philosophical Essays by Joseph Dietzgen, published by Charles H. Kerr 1917, Edited by Eugene Dietzgen and Joseph Dietzgen Jr., translated by M. Beer and Th. Rothstein; First Published: Volksstaat, 1875.
"The Limits of Cognition," by Joseph Dietzgen, Source: Joseph Dietzgen, Philosophical Essays, Charles Kerr & Co., Chicago 1906, pp. 224-235; First published: in Vorw?rts, 1877; Translated: by M. Beer & Th. Rothstein, Edited by Eugene Dietzgen & Joseph Dietzgen Jr..
