^Bratberg, Terje; Mardal, Magnus A. "Oscar 2.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 4 January 2024.
^Bell, Daniel (2003). Encyclopedia of international games. Jefferson, N.C.: McFarland & Co. p. 473. ISBN0-7864-1026-4.
^Lauritzen, Per Roger. "Torbjørg Utne". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 11 February 2024.