^Bratberg, Terje; Mardal, Magnus A.
"Oscar 1.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 1 January 2024.
^Bratberg, Terje; Mardal, Magnus A.
"Oscar 1.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 1 January 2024.