ALTENHEIN, Hans. Transsibirische Reise. Erinnerung an Helga M. Novak. Studia Germanica Gedanensia, [S. l.], n. 36, p. 220–223, 2017. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/SGG/article/view/1342. Acesso em: 31 maj. 2025.