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*''Reilly : Ace of Spies'' by Robin Bruce Lockhart 1984. Originally published 1967 as ''Ace of Spies''. [https://archive.org/details/reilly00robi Digital book file 1], [https://archive.org/details/reillyaceofspies00lock Digital book file 2] Archive.org Lending Library. The author was the son of Robert Bruce Lockhart above who was one of Sidney Reilly's fellow spies. A television miniseries was made in 1983, based on the book. [https://en.wikipedia.org/wiki/Reilly,_Ace_of_Spies Reilly, Ace of Spies] Wikipedia.

:[https://archive.org/details/masterspytruesto00vand ''Master Spy : a true story of Allied espionage in Bolshevik Russia''] by Edward Van Der Rhoer 1981. Archive.org Books to Borrow/Lending Library. About Sidney George Reilly.

*[https://archive.org/details/mysecretservicev00manwrich ''My Secret Service: Vienna--Sophia--Constantinople--Nish--Belgrade--Asia Minor, etc''] by 'The Man Who Dined With the Kaiser' 1916. Archive.org. The author was in Constantinople when the evacuation of Gallipoli was announced. [http://trove.nla.gov.au/newspaper/article/23605620 A press report of the time] indicates the author was a special reporter representing the London ''Daily Mail'', and speculates he was a Dutchman.

*[https://archive.org/details/secretsofgermanw00gravuoft/page/n9 ''The Secrets of the German War Office''] by Dr Armgaard Karl Graves (pseud) and Edward Lyell Fox 2nd printing 1914. Archive.org. "Written by the ghostwriter Edward Lyell Fox, the book contained a fair amount of fairy tales, but was also interspersed with details of Graves’ espionage career in both [German and British] services".<ref>Clarke, Jon. [https://forum.axishistory.com/viewtopic.php?t=215688 Book: "The Secrets of the German War Office"] ''Axis History Forum'' 18 May 2015, quoting Thomas Boghardt's book ''Spies Of The Kaiser''. Retrieved 4 October 2019.</ref> [https://www.nrscotland.gov.uk/research/learning/first-world-war/the-kaisers-spy-in-scotland-naval-espionage-before-the-great-war "The Kaiser's Spy in Scotland - Naval Espionage before the Great War"] National Records of Scotland.

*[https://archive.org/details/celebratedspiesf00bart ''Celebrated Spies and Famous Mysteries of the Great War''] by George Barton 1919 Archive.org

*[https://hdl.handle.net/2027/mdp.39015008844493?urlappend=%3Bseq=7 ''German spies at bay, being an actual record of the German espionage in Great Britain during the years 1914-1918, comp. from official sources''] by Sidney Theodore Felstead.[1920] HathiTrust Digital Library.

: Peter Hopkirk was with ''The Times'' of London for nineteen years, as chief reporter and Middle and Far East specialist.

*Also see the various '''Fronts''' mentioned above.