KREEM, J. Zu Briefbeförderung des Deutschen Ordens in Livland im 15. und 16. Jahrhundert. Die Eilbriefe. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders, [S. l.], v. 26, p. 73–90, 2021. DOI: 10.12775/OM.2021.004. Disponível em: https://apcz.umk.pl/OM/article/view/32925. Acesso em: 29 mar. 2024.