MARKIEWICZ, H. Professor Józef Frank – social activist and popularizer of science. Pedagogical Forum, [S. l.], v. 11, n. 2, p. 257–265, 2021. DOI: 10.21697/fp.2021.2.18. Disponível em: https://www.czasopisma.uksw.edu.pl/index.php/fp/article/view/9608. Acesso em: 20 may. 2024.