Albrectsen, E. (2017). Rex Insularum. the King of Norway and His ’Skattlands’ as a Political System c. 1260 - c. 1450. Ed.: Steinar Imsen. Fagbokforlaget, Bergen, 2014. Historisk Tidsskrift, 116(2). Hentet fra https://tidsskrift.dk/historisktidsskrift/article/view/56859