https://collections.royalarmouries.org/first-world-war/type/rac-narrative-77.html

https://www.wellington.ca/en/discover/mus-1917-webley-mk-vi-revolver.aspx

http://tonnel-ufo-portuguese.tk/articles.php?id=1968

https://www.gov.uk/government/publications/firearms-law-guidance-to-the-police-2012/guide-on-firearms-licensing-law-accessible-version