West, N. (2022). Spies who changed history: The greatest spies and agents of the 20th century. Frontline Books.
Chicago Style (17th ed.) CitationWest, Nigel. Spies Who Changed History: The Greatest Spies and Agents of the 20th Century. Yorkshire ; Philadelphia: Frontline Books, 2022.
MLA (9th ed.) CitationWest, Nigel. Spies Who Changed History: The Greatest Spies and Agents of the 20th Century. Frontline Books, 2022.
Warning: These citations may not always be 100% accurate.