^Bratberg, Terje; Mardal, Magnus A.
"Oscar 2.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 4 January 2024.
^Haugland, Ånund.
"Aasa Helgesen". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 8 January 2024.
^Aaserud, Anne.
"Anna Schønheyder". Norsk kunstnerleksikon (in Norwegian). Oslo. Retrieved 21 October 2017.
^Bratberg, Terje; Mardal, Magnus A.
"Oscar 2.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 4 January 2024.
^Haugland, Ånund.
"Aasa Helgesen". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 8 January 2024.
^Aaserud, Anne.
"Anna Schønheyder". Norsk kunstnerleksikon (in Norwegian). Oslo. Retrieved 21 October 2017.