TORTZEN, Christian Gorm. Claus Friisberg: Tankens pioner. Sokrates i Platons forsvarstale: Anmeldt af Chr. Gorm Tortzen. AIGIS, [S. l.], v. 17, n. 2, 2024. Disponível em: https://tidsskrift.dk/aigis/article/view/145928. Acesso em: 6 dec. 2025.