KAWAŁKO, Bogdan. Pieniądz Europy. Regional Barometer. Analyses & Prognoses, [S. l.], n. 1, p. 68–69, 2002. DOI: 10.56583/br.1797. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1797. Acesso em: 28 apr. 2025.