FRANKSEN, Ole Immanuel; HELK, Vello; LAUSTEN, Martin Schwarz. Corfitz Ulfeldts katolske chifferbrev. Kirkehistoriske Samlinger, [S. l.], p. 17–79, 2025. Disponível em: https://tidsskrift.dk/kirkehistoriskesamlinger/article/view/151149. Acesso em: 25 dec. 2025.