MICHELSEN, William. Holger Kjær: Højskolens Grund. Grundtvig-Studier, [S. l.], v. 25, n. 1, p. 63–65, 1972. DOI: 10.7146/grs.v25i1.14938. Disponível em: https://tidsskrift.dk/grs/article/view/14938. Acesso em: 7 dec. 2025.