RIDDOCH, S. A. Karl Holl and the Fatherland Party, 1917-1918: A German Liberal Protestant Embraces the Right. Historical Papers, [S. l.], 2014. Disponível em: https://historicalpapers.journals.yorku.ca/index.php/historicalpapers/article/view/39321. Acesso em: 20 jan. 2022.