KOLASA, W. M. An Outline of the Statistics of the Polish Press 1864–1918. Rocznik Historii Prasy Polskiej, [S. l.], v. 19, n. 1, p. 21–42, 2016. Disponível em: https://rhpp.uken.krakow.pl/article/view/3057. Acesso em: 28 kwi. 2024.