High Bowershield (Elsdon) - Source of Reference
The information on this website is based on a range of published and unpublished works. Below is a list of the source of information used in writing this record.
1) Ryder, P F 06-AUG-90 Field investigation
2) Ryder, P F, 1990. Bastles and Towers in the Northumberland National Park. Unpublished (15)
3) This record includes National Record of the Historic Environment Information provided by Historic England on 4 January 2021 licensed under the Open Government Licence [http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/]
3a) Dodds, J F, 1999. Bastions and Belligerents: Medieval Strongholds in Northumberland, p330-1