1. Goldberg, Bettina. “Radical German-American Freethinkers and the Socialist Labor Movement: The Freie Gemeinde in Milwaukee, Wisconsin”. IN: Keil, Hartmut, edited by. German Workers’ Culture in the United States, 1850 to 1920. Washington, D.C.: Smithsonian Institution Press; 1988; pp. 241-260.
  2. Kneevers, Earl E. Jr. and Charmaine Chopp Kneevers. The Sheboygan Socialists. Zeidler, Frank P., foreword by. Sheboygan Falls, Wis. : Sheboygan County Historical Research Center; 2003. xvii, 184 p. Notes: An overall picture of the political and social activities of the Socialist Party of Sheboygan is provided, primarily based upon a minute book of the meetings of the party during the period from 1924 through 1939; over fifty related illustrations are provided. The authors also analyzed the issues of The Wisconsin Comrade, published from March 1914 to June 1916 by the Social-Democratic Party of Wisconsin, for any news related to members of the Socialist branches located in both the city and county of Sheboygan..