Nawracaj, W. 2021. Formation of Presidency in the Second Polish Republic in Comparison to a Concept of Strenghtened Presidency in the Weimar Republic and Finland Under the Constitution of 1919. Vade Nobiscum, tom XXIII/2021: Studia nad XIX i XX wiekiem. K. Gryglewski et al., eds. Lodz University Press. 89–107.