ALBREGTSEN, E. Peter Munz: Frederick Barbarossa. A Study in Medieval Politics. London, Eyre & Spottiswoode, 1969. xxi, 422 s. 8 plancher. 2 kort. 90 sh. Historisk Tidsskrift, [S. l.], v. 12, 1973. Disponível em: https://tidsskrift.dk/historisktidsskrift/article/view/51421. Acesso em: 16 jul. 2024.