Undercover (OSS training film) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Undercover (OSS training film)" in English language version.

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Richards, Jeffrey (20 February 2020). The Lost Worlds of John Ford: Beyond the Western. Bloomsbury Publishing. p. 236. ISBN 978-1-350-11468-5.

"A Look Back ... John Ford: War Movies — Central Intelligence Agency". www.cia.gov. Central Intelligence Agency. Archived from the original on January 13, 2009. Retrieved 9 September 2017.
Chambers II, Dr. John Whiteclay (June 2010). "Office of Strategic Services Training During World War II" (PDF). Studies in Intelligence. 54 (2): 5, 10, 19. Archived from the original (PDF) on July 7, 2010. Retrieved 10 September 2017.

Axmaker, Sean. "How to Operate Behind Enemy Lines". Turner Classic Movies. Retrieved 9 September 2017.

"A Look Back ... John Ford: War Movies — Central Intelligence Agency". www.cia.gov. Central Intelligence Agency. Archived from the original on January 13, 2009. Retrieved 9 September 2017.
Chambers II, Dr. John Whiteclay (June 2010). "Office of Strategic Services Training During World War II" (PDF). Studies in Intelligence. 54 (2): 5, 10, 19. Archived from the original (PDF) on July 7, 2010. Retrieved 10 September 2017.