Antiquarian Horological Society
AHS Turret Clock database
2015
Sources for Barholm: St Martin
CWGC
Commonwealth War Graves Commission
2016
Cathedral and Church Buildings Division
Research into the Presence of Bats in Churches
2014
Colin Harrison
Certificate of Practical Completion of works authorised by Faculty
2018
Keltek Trust
Interior image of 621004 St Martin, Barholm
2015, September 21
Tony Atkin (of geograph.org.uk)
Exterior image of 621004 St Martin, Barholm
2011, September 01
Church Buildings Council
Church Bells
2019
Church of England
A Church Near You
2021
Peter H Slinger
Final Certificate of Completion
23rd March, 2021
ICBS
Incorporated Church Building Society Archive
1817-1989