Robert M. Berdahl, "Conservative Politics and aristocratic landholders in Bismarckian Germany." Journal of Modern History 44#1 (1972): 2–20. in JSTOR (页面存档备份,存于互联网档案馆).
web.archive.org
Robert M. Berdahl, "Conservative Politics and aristocratic landholders in Bismarckian Germany." Journal of Modern History 44#1 (1972): 2–20. in JSTOR (页面存档备份,存于互联网档案馆).