Rose, Mark. "Gorm the Old Goes Home". Archaeology. Archaeological Institute of America. Archived from the original on 9 November 2022. Retrieved 9 November 2022.
archive.org
A. Förstemann, Altdeutsches Namenbuch (1856), 631f.
bluetooth.com
The story behind how Bluetooth® technology got its name, [1]Archived 28 December 2020 at the Wayback Machine .
books.google.com
Mortuo patre, [Haraldus] quinquaginta annos regnavit. Hic Christianus extitit cognomine Blatan sive Clac Harald.
ed. Langebek (1772) p. 375Archived 14 April 2023 at the Wayback Machine.
Skovgaard-Petersen, Inge (2003), Helle, Knut (ed.), "The making of the Danish kingdom", The Cambridge History of Scandinavia: Volume 1: Prehistory to 1520, Cambridge University Press, p. 176, ISBN978-0-521-47299-9, archived from the original on 8 January 2022, retrieved 8 January 2022
denstoredanske.dk
"Tamdrup Kirke". Den store danske. Archived from the original on 20 September 2014. Retrieved 3 November 2012.
Mortuo patre, [Haraldus] quinquaginta annos regnavit. Hic Christianus extitit cognomine Blatan sive Clac Harald.
ed. Langebek (1772) p. 375Archived 14 April 2023 at the Wayback Machine.
Skovgaard-Petersen, Inge (2003), Helle, Knut (ed.), "The making of the Danish kingdom", The Cambridge History of Scandinavia: Volume 1: Prehistory to 1520, Cambridge University Press, p. 176, ISBN978-0-521-47299-9, archived from the original on 8 January 2022, retrieved 8 January 2022
Rose, Mark. "Gorm the Old Goes Home". Archaeology. Archaeological Institute of America. Archived from the original on 9 November 2022. Retrieved 9 November 2022.