Krag, Claus (30 June 2022). "Sigurd 1. Magnusson Jorsalfare". Archived from the original on 27 January 2022. Retrieved 12 July 2022 – via Store norske leksikon.
snl.no
Krag, Klaus (6 December 2021). "Sigurd 1 Magnusson Jorsalfare". Norsk biografisk leksikon. Archived from the original on 14 August 2011. Retrieved 19 May 2009.
web.archive.org
Krag, Claus (30 June 2022). "Sigurd 1. Magnusson Jorsalfare". Archived from the original on 27 January 2022. Retrieved 12 July 2022 – via Store norske leksikon.
Krag, Klaus (6 December 2021). "Sigurd 1 Magnusson Jorsalfare". Norsk biografisk leksikon. Archived from the original on 14 August 2011. Retrieved 19 May 2009.