Haugen, E. I., & Cai, C. (1993). Ole Bull: Norway's romantic musician and cosmopolitan patriot. University of Wisconsin Press.
Chicago-viite (17. p.)Haugen, Einar Ingvald, ja Camilla Cai. Ole Bull: Norway's Romantic Musician and Cosmopolitan Patriot. Madison: University of Wisconsin Press, 1993.
MLA-viite (8. p.)Haugen, Einar Ingvald, ja Camilla Cai. Ole Bull: Norway's Romantic Musician and Cosmopolitan Patriot. University of Wisconsin Press, 1993.
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