LANDAU, Zbigniew. Some Economic Problems of Polish-American Relations in 1918-1920. Studia Historiae Oeconomicae, [S. l.], v. 3, n. 1, p. 201–220, 1969. DOI: 10.14746/sho.1969.03.1.011. Disponível em: https://pressto.amu.edu.pl/index.php/sho/article/view/57020. Acesso em: 3 oct. 2026.