Byberg, Øystein (18 May 2006). "Nytt styre i Gyldendal" (in Norwegian). Hegnar Online. Archived from the original on 26 September 2007. Retrieved 7 September 2007.
Byberg, Øystein (18 May 2006). "Nytt styre i Gyldendal" (in Norwegian). Hegnar Online. Archived from the original on 26 September 2007. Retrieved 7 September 2007.