Judith Jesch: Earl Rögnvaldr of Orkney, a Poet of the Viking Diaspora. In: Journal of the North Atlantic, Sonderband 4 (2013): Introduction and General Acknowledgments: Inaugural St. Magnus Conference, S. 155. JSTOR:26686977
Patrick Topping: Harald Maddadson, Earl of Orkney and Caithness, 1139–1206. In: The Scottish Historical Review, Band 62, Heft 174 (1983), S. 106, JSTOR:25529533
Judith Jesch: Earl Rögnvaldr of Orkney, a Poet of the Viking Diaspora. In: Journal of the North Atlantic, Sonderband 4 (2013): Introduction and General Acknowledgments: Inaugural St. Magnus Conference, S. 157. JSTOR:26686977
Alison Finlay: Skalds, Troubdours and Sagas. In: Viking Society for Northern Research (Hrsg.): Saga-Book, Band 24 (1994–1997), S. 106. JSTOR:48611733
Patrick Topping: Harald Maddadson, Earl of Orkney and Caithness, 1139–1206. In: The Scottish Historical Review, Band 62, Heft 174 (1983), S. 109, JSTOR:25529533
Judith Jesch: Earl Rögnvaldr of Orkney, a Poet of the Viking Diaspora. In: Journal of the North Atlantic, Sonderband 4 (2013): Introduction and General Acknowledgments: Inaugural St. Magnus Conference, S. 158. JSTOR:26686977
