James Campbell, The Anglo-Saxons, pg. 145
 
S. Keynes and M. Lapidge, Alfred the Great, pp. 13
 
While most of the information in the Viking Tour represents a combination of the sources mentioned in the footnotes, the details for the description of the invasion from 865 - 871 stems almost entirely from: S. Keynes and M. Lapidge, Alfred the Great, pp. 16-17
   
James Campbell, The Anglo-Saxons, pg. 145