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Fensom, Harry. "How Colossus Was Built and Operated -- One of Its Engineers Reveals Its Secrets." In Colossus: The Secret of Bletchley Park's Codebreaking Computers, eds. B. Jack Copeland, et al., 297-306. Oxford & New York: Oxford University Press, 2006.

Ferris, John.

1. "From Broadway House to Bletchley Park: The Diary of Captain Malcolm D. Kennedy, 1934-1946." Intelligence and National Security 4, no. 3 (Jul. 1989): 421-450.

Kennedy worked as a Japanese translator, including in the Japanese Diplomatic Section, in the Government Code and Cypher School (GC&CS) from 1934 to 1946. His diary from that period is "unusually discreet," but still offers a number of insights into the work at Broadway House, Bletchley Park, and Berkeley Street. The pages from 430 to 444 consist of selections from Kennedy's diaries. Sexton calls this a "very valuable source."

2. "Ralph Bennett and the Study of Ultra." Intelligence and National Security 5, no. 2 (Apr. 1991): 473-486.

The author surveys the historiographical implications of the revelation of Ultra for historians. Bennett's Ultra and Mediterranean Strategy (1989) is offered as a model for historians to look to in assessing the Ultra's impact on decisionmakers.

Field, Judith Veronica. "British Cryptanalysis: The Breaking of 'Fish' Traffic." In Scientific Research in World War II: What Scientists did in the War, eds. Ad Maas and Hans Hooijmaijers, 213-231. London: Routledge, 2009.

Filby, P. William.

1. "The Best Kept Secret of the Second World War." A.B. Bookman's Weekly 79 (29 Jun. 1987): 2872-2879.

According to Sexton, this article "reviews the story of the breaking of the German ENIGMA cipher system."

2. "Bletchley Park and Berkeley Street." Intelligence and National Security 3, no. 2 (Apr. 1988): 272-284.

The author was a cryptanalyst who worked on diplomatic traffic at both sites during World War II.

3. "Floradora and a Unique Break into One-Time Pad Ciphers." Intelligence and National Security 10, no. 3 (Jul. 1995): 408- 422.

This article is based on the author's memory "without recourse to official papers." According to Filby, Floradora was broken in 1943, not in 1942 as stated in Alastair G. Denniston, "The Government Code and Cypher School Between the Wars," Intelligence and National Security 1, no. 1 (Jan. 1986), p. 56.

Fitzgerald, Penelope. The Knox Brothers. New York: Coward, McCann, & Geoghegan, 1977. Rev. ed. Washington, DC: Counterpoint, 2000.

According to Kruh, Cryptologia 25.2, this is the biography of the author's father (Edmund) and his three brothers. One of the brothers was Dillwyn "Dilly" Knox who played a major role as a British codebreaker in World War I (Room 40), during the interwar years (Foreign Office) and in World War II (Bletchley Park). Sexton terms this an "[o]utstanding biography of the four Knox brothers." The author views Dillwyn Knox as "one of the most important cryptanalysts of all time."

FitzGibbon, Constantine. "'The Ultra Secret': Enigma in the War." Encounter 44 (Mar. 1975): 81-85.

Clark comment: This is a review of Winterbotham's The Ultra Secret. Sexton sees the article as a "balanced account ... that serves as a needed corrective to popular myths" surrounding the use of Ultra.

Flowers, Thomas H.

1. "Colossus." In Colossus: The Secret of Bletchley Park's Codebreaking Computers, eds. B. Jack Copeland, et al., 91-100. Oxford & New York: Oxford University Press, 2006.

2. "D Day at Bletchley Park." In Colossus: The Secret of Bletchley Park's Codebreaking Computers, eds. B. Jack Copeland, et al., 78-83. Oxford & New York: Oxford University Press, 2006.

Floyd, William F., Jr. "The Work of British Code Breakers at Bletchley Park during World War II Foiled the German U-Boat Threat." Military Heritage 16, no. 6 (May 2015): 16-19, 70.

The capture of an Enigma machine from U-110 and the code breaking work on Alan Turing's "bombes" at Bletchley Park.

Footitt, Hilary. "Another Missing Dimension? Foreign Languages in World War II Intelligence." Intelligence and National Security 25, no. 3 (Jun. 2010): 271-289.

From "Abstract": "By examing the role of linguists in Y stations and at Bletchley Park..., the article explores the institutional language policies developed for intelligence, and the working practices of those with foreign language skills."

Foss, Hugh. "Reminiscences on Enigma." In Action This Day: Bletchley Park from the Breaking of the Enigma Code to the Birth of the Modern Computer, eds. Ralph Erskine and Michael Smith, 41-46. London and New York: Bantam, 2001.

Freedman, Maurice.

1. The Codebreakers, 1901-1945: Bletchley Park and the Second World War. London: Cooper, 2000.

Note from Royal Historical Society Database: "Republished as Unravelling Enigma, 2001." (See below)

2. Unravelling Enigma: Winning the Code War at Station X. Barnsley, UK: Leo Cooper, 2001.

Kruh, Cryptologia 25.2, calls this book a "concise and readable account." On the other hand, Erskine, I&NS 17.1, says that "Unravelling Enigma contains no real insights into what made Bletchley so successful, and does not convey the flavour of working there. Regrettably, it does not deliver on its title, and cannot be recommended, even for the general reader."

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