An Alternative to ‘Celtic from the East’ and ‘Celtic from the West’, Patrick Sims-Williams, April 2020: link
Dragon Lords: The History & Legends of Viking England: The History and Legends of Viking England, Eleanor Parker, 2018
Rulership in 1st to 14th century Scandinavia, Royal graves and sites at Avaldsnes and beyond, Edited by Dagfinn Skre, 2020