FREDERICIA, Johnny. Island - istidernes ø. Varv, [S. l.], v. 1984, n. 4, p. 116–121, 1984. DOI: 10.7146/varv.v1984i4.145240. Disponível em: https://tidsskrift.dk/varv/article/view/145240. Acesso em: 6 dec. 2025.