^Langslet, Lars Roar; Mardal, Magnus A.
"Karl 2.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 18 December 2023.
^Mardal, Magnus A.
"Karl Johan". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 18 December 2023.
^Langslet, Lars Roar; Mardal, Magnus A.
"Karl 2.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 18 December 2023.
^Mardal, Magnus A.
"Karl Johan". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 18 December 2023.