Changes

*[https://archive.org/details/geniusfordecepti0000rank/mode/2up ''A genius for deception : how cunning helped the British win two world wars''] by Nicholas Rankin 2009. Archive.org Books to Borrow/Lending Library. First published in Great Britain as ''Churchill's Wizards : the British genius for deception, 1914-1945'' in 2008. [https://archive.org/details/geniusfordecepti0000rank/page/174/mode/2up "Part II" [WW2<nowiki>]</nowiki>] page 175.

*[https://archive.org/details/greatworldwar19100pete/mode/2up ''The Great World War, 1914-45, Volume 1 Lightning strikes twice''] edited by Peter Liddle, John Bourne and Ian Whitehead. Multiple authors. 2000. Archive.org Books to Borrow/Lending Library.

*[https://archive.org/details/secretwarspiesco0000hast_k7z8 ''The Secret War : Spies, Codes and Guerrillas 1939-45''] by Max Hastings 2015. Archive.org Books to Borrow/ Lending Library. [https://en.wikipedia.org/wiki/Max_Hastings Max Hastings] Wikipedia. British journalist/editor and military historian.

*[https://archive.org/details/timeforcourage00terr/page/n7 ''A Time for Courage : the Royal Air Force in the European War, 1939-1945''] by John Terraine 1985. Later published as [https://archive.org/details/rightoflineroyal0000terr/page/n3 ''The Right of the Line : the Royal Air Force in the European War, 1939-1945''] by John Terraine 1988. Both Archive.org Books to Borrow/ Lending Library.