KELLER, Dawid. Polish State Railways in 1945–1989 – A Research Contribution. Studia Historiae Oeconomicae, [S. l.], v. 39, n. 1, p. 216–249, 2021. DOI: 10.2478/sho-2021-0009. Disponível em: https://pressto.amu.edu.pl/index.php/sho/article/view/sho-2021-0009. Acesso em: 4 may. 2024.