1. Directorate for Cultural Heritage (Riksantikvaren). 1991/2008. Riksantikvarens informasjon om kulturminner 3:3. Accessed May 7, 2018. https://brage.bibsys.no/xmlui/handle/11250/175379 [text in Norwegian].
2. Meld. St. 19. (2016–2017): Opplev Norge – unikt og eventyrlig (White paper issued by the Ministry of Trade, Industry and Fisheries, 17 March 2017). Accessed May 7, 2018. https://www.regjeringen.no/contentassets/95efed8d5f0442288fd430f54ba244be/no/pdfs/stm201620170019000dddpdfs.pdf [text in Norwegian].