O´Loughlin, John, Colin Flint, and Michael Shin. “Regions and Milieux in Weimar Germany: The Nazi Party Vote of 1930 in Geographic Perspective”. ERDKUNDE 49, no. 4 (December 31, 1995): 305–314. Accessed April 30, 2025. https://www.erdkunde.uni-bonn.de/article/view/2328.