Vikor L. S. The Nordic language area and the languages in the north of Europe. In: BANDLE, Oskar; BRAUNMÜLLER, Kurt; ELMEVIK, Lennart; JAHR, Ernst Hakon; WIDMARK, Gun, Hans-Peter Naumann; KARKER, Allan; TELEMANN, Ulf The Nordic Languages (An International Handbook of the History of the North Germanic Languages). [s.l.]: Walter de Gruyter, 2002. 1057 s. Dostupné online.ISBN 978-3-11014876-3. S.1 a nasl..