SACEWICZ, K. The Polish Underground State vs. The Polish Communists, and the concept of counteraction. Echa Przeszłości, [S. l.], n. XXII/2, p. 221–240, 2021. DOI: 10.31648/ep.7214. Disponível em: https://czasopisma.uwm.edu.pl/index.php/ep/article/view/7214. Acesso em: 18 sie. 2022.