BOLARIĆ, Marijan. Analytical Survey on the International Exchange of Croatian Letter Mail. Promet - Traffic&Transportation, [S. l.], v. 9, n. 5-6, p. 253–259, 2012. Disponível em: https://traffic2.fpz.hr/index.php/PROMTT/article/view/1842. Acesso em: 26 aug. 2025.