Snorri Sturlusson, Heimskringla or The Chronicle of the Kings of Norway (c.1230), trans. Douglas B. Killings, Medieval and Classical Literature Library, http://mcllibrary.org/Heimskringla/ (accessed 5 May 2018) 1
Ervin, Linda; Ruth Bogusis (Summer 1977). "Collections of Ethnic Canadiana at the National Library of Canada: the Ethnic Serials Project". Serials Librarian. 1 (4): 334. ISSN0361-526X.