Sources
https://www.publishersweekly.com/978-1-59240-900-
http://www.washingtonindependentreviewofbooks.com/index.php/bookreview/the-spy-who-couldnt-spell-a-dyslexic-traitor-an-unbreakable-code-and-the-fb
https://www.theguardian.com/world/2016/oct/26/spy-couldnt-spell-how-biggest-heists-us-espionage-history-foiled
https://www.fbi.gov/history/famous-cases/brian-p-regan-espionage
http://www.washingtonindependentreviewofbooks.com/index.php/bookreview/the-spy-who-couldnt-spell-a-dyslexic-traitor-an-unbreakable-code-and-the-fb
https://www.theguardian.com/world/2016/oct/26/spy-couldnt-spell-how-biggest-heists-us-espionage-history-foiled
https://www.fbi.gov/history/famous-cases/brian-p-regan-espionage