ORCZYK, Józef. Profitability of Agricultural Farms in the Years 1929-1937. Studia Historiae Oeconomicae, [S. l.], v. 7, n. 1, p. 141–158, 1973. DOI: 10.14746/sho.1973.07.1.009. Disponível em: https://pressto.amu.edu.pl/index.php/sho/article/view/57590. Acesso em: 20 oct. 2026.