LUNN, Nils. Træl – Tralle – Trælleborg. Kuml, [S. l.], v. 7, n. 7, p. 81–85, 1957. DOI: 10.7146/kuml.v7i7.97588. Disponível em: https://tidsskrift.dk/kuml/article/view/97588. Acesso em: 6 dec. 2025.