Ragnar's sons
Wayback Machine - Wikipedia
https://en.wikipedia.org/wiki/Wayback_MachineKings and kingship in Viking Northumbria
https://web.archive.org/web/20080926171200/http://www.dur.ac.uk/medieval.www/sagaconf/mcturk.htmRory McTurk - Wikipedia
https://en.wikipedia.org/wiki/Rory_McTurkError - Durham University
http://www.dur.ac.uk/medieval.www/sagaconf/mcturk.htmBook sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/978-0521829922Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/978-0-521-82992-2Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/0-521-44049-1https://doi.org/10.1093%2Fref%3Aodnb%2F49260
https://doi.org/10.1093%2Fref%3Aodnb%2F49260Digital object identifier - Wikipedia
https://en.wikipedia.org/wiki/Doi_(identifier)Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/978-1163125991International Standard Book Number - Wikipedia
https://en.wikipedia.org/wiki/ISBN_(identifier)
Ragnar Lodbrok
The Real Ragnar Lothbrok - Historic UK
https://www.historic-uk.com/HistoryUK/HistoryofEngland/Ragnar-Lothbrok/The Project Gutenberg eBook of The Viking Age, Vol. 2, by Paul B. Du Chaillu
https://www.gutenberg.org/files/56168/56168-h/56168-h.htm