Wrzesińska, K. “Discussions of Human Origin, the Racial Differentiation of Mankind and ’racial hate’ in Biblioteka Warszawska, 1864–1914”. Yearbook of the History of Polish Press, vol. 24, no. 1, Apr. 2021, pp. 43-58, https://rhpp.uken.krakow.pl/article/view/9974.