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Kjøllesdal, Svein Rune (8 August 2011). "Østbø signerte for Start". Fædrelandsvennen (in Norwegian). Archived from the original on 12 January 2013. Retrieved 15 August 2012.
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"Jarstein blir i Viking". Nettavisen (in Norwegian). Norwegian News Agency. 31 January 2013. Archived from the original on 3 December 2013. Retrieved 23 February 2013.
Skjervengen, Ole (2 November 2015). "To keepere klare for 08". Sarpsborg 08 FF (in Norwegian). Archived from the original on 27 November 2015. Retrieved 26 November 2015.