FRIIS, AAGE. Historieforskernes internationale Organisation. Historisk Tidsskrift, [S. l.], v. 9, 1927. DOI: 10.7146/ht.v9i0.55513. Disponível em: https://tidsskrift.dk/historisktidsskrift/article/view/55513. Acesso em: 3 aug. 2026.