Jim Samson. Music and Nationalism: Five Historical Moments. In: Nationalism and Ethnosymbolism: History, Culture and Ethnicity in the Formation of Nations. Athena S. Leoussi and Steven Grosby (editors); pp. 55-67. Edinburgh University Press. 2007. ISBN978-0-7486-2113-2. Quote from page 63:"During the war, Johansen supported the Quisling government during the German occupation."