KAWAŁKO, Danuta. Historia Pieniądza. Regional Barometer. Analyses & Prognoses, [S. l.], n. 1, p. 64–67, 2002. DOI: 10.56583/br.1796. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1796. Acesso em: 28 apr. 2025.