«Capitulare Bononiense». Translations and ReprintsVI. Consultado el 21 de noviembre de 2014. «Ch. 10. It has been enacted that no bishop or abbot or abbess, or any rector or guardian of a church, shall presume without our permission to give or sell a byrnie or sword to any man outside, except only to his own vassals.»
British Museum 1848, 1021.1. Kendrick, T. D. (1934): 'Some types of ornamentation on Late Saxon and Viking Period Weapons in England', Eurasia Septentrionalis Antiqua, ix, 396 and fig. 2; Maryon, Herbert. (1950): 'A Sword of the Viking Period from the River Witham', The Antiquaries Journal, xxx, 175–79; '
Maryon, Herbert (1948). «A Sword of the Nydam Type from Ely Fields Farm, near Ely». Proceedings of the Cambridge Antiquarian SocietyXLI: 73-76. doi:10.5284/1034398.
