CWGC
Commonwealth War Graves Commission
2016
Sources for Thurlby: St Firmin
Cathedral and Church Buildings Division
Research into the Presence of Bats in Churches
2014
Julian P Guffogg (of geograph.org.uk)
Exterior image of 621031 St Firmin, Thurlby
2015, June 12
Keltek Trust
Interior image of 621031 St Firmin, Thurlby
2015, September 21
Church Buildings Council
Church Bells
2019
Church of England
A Church Near You
2021