KLAFFENBOCK, Arnold. Helmut Qualtinger (1928-1986). Legenda za życia. Biblioteka, [S. l.], n. 12(21), p. 221–226, 2008. Disponível em: https://pressto.amu.edu.pl/index.php/b/article/view/215. Acesso em: 19 kwi. 2024.