GRUCHAŁA, Irena. Herman Stachel – a Lviv publisher of popular literature. Folia Toruniensia, [S. l.], v. 18, p. 35–56, 2018. DOI: 10.12775/FT.2018.003. Disponível em: https://apcz.umk.pl/FT/article/view/FT.2018.003. Acesso em: 8 jul. 2025.