^Rian, Øystein; Mardal, Magnus A.; Weidling, Tor Ragnar.
"Christian 4.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 21 December 2023.
^Rian, Øystein; Mardal, Magnus A.; Weidling, Tor Ragnar.
"Christian 4.". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 21 December 2023.