^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.
^Eriksson, Bo (2007). Lützen 1632 (in Swedish). Stockholm: Norstedts Pocket. pp. 67–73.
ISBN978-91-7263-790-0.
^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.
^Eriksson, Bo (2007). Lützen 1632 (in Swedish). Stockholm: Norstedts Pocket. pp. 67–73.
ISBN978-91-7263-790-0.