Beesly, P. (1977). Very special intelligence: The story of the Admiralty's Operational Intelligence Centre, 1939-1945. Hamish Hamilton.
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Chicago-čujuhus (17. p.)
Beesly, Patrick. Very Special Intelligence: The Story of the Admiralty's Operational Intelligence Centre, 1939-1945. London: Hamish Hamilton, 1977.
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MLA-čujuhus (9. p.)
Beesly, Patrick. Very Special Intelligence: The Story of the Admiralty's Operational Intelligence Centre, 1939-1945. Hamish Hamilton, 1977.
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