Bolton, Timothy (2009): The Empire of Cnut the Great: Conquest and the Consolidation of Power in Northern Europe in the Early Eleventh Century, s. 162.
Hybel, Nils; Poulsen, Bjørn (2007): The Danish Resources c. 1000-1550: Growth and Recession, s. 86
The Anglo-Saxon Chronicle. Everyman Press: London, 1912. Oversatt av James Ingram (London, 1823) og J.A. Giles (London, 1847). Online Medieval and Classical Library Release #17. Oversatt til norsk av Wikipedia for anledningen