↑Koenraad De Smedt, Gunn Inger Lyse, Anje Müller Gjesdal, Gyri S. Losnegaard: The Norwegian Language in the Digital Age (= White Paper Series). Springer, Berlin / Heidelberg 2012, ISBN 978-3-642-31388-2, S.45, doi:10.1007/978-3-642-31389-9 (englisch, springer.com): “Norwegian is the common spoken and written language in Norway and is the native language of the vast majority of the Norwegian population (more than 90%) and has about 4,320,000 speakers at present.”