Norwegian Kingship in the High Middle Ages (BRILL) ISBN 9789004166615 Bagge, Sverre (2012) From Viking Stronghold to Christian Kingdom: State Formation
1130-1350. Aschehougs Norgeshistorie 3. Aschehoug. 1995. ISBN 8203220312. Bagge, Sverre. From Gang Leader to the Lord's Anointed: Kingship in Sverris saga and