Kjeldstadli, Knut. “Ad Knotter, Transformations of Trade Unionism. Comparative and Transnational Perspectives on Workers Organizing in Europe and the United States, Eighteenth to Twenty-First Centuries”. TSEG - The Low Countries Journal of Social and Economic History, vol. 16, no. 3-4, Feb. 2020, pp. 121-4, https://doi.org/10.18352/tseg.1120.