FREY, Yves. The crisis of the thirties. The Poles: out!. Polonia Inter Gentes, [S. l.], n. 3, p. 15–30, 2023. DOI: 10.56583/pig.2078. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/pig/article/view/2078. Acesso em: 5 grudz. 2025.