DZA Potsdam Reichsamt des Innern, 34 seiten, SPD und Armee (1893) 15185, Box: 11, Folder: 15-16. German State Documents, RH MS 228. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/6765 Accessed January 01, 2025.