Keene, C. (1981). The clue in the crossword cipher. Armada books.
Chicago-čujuhus (17. p.)Keene, Carolyn. The Clue in the Crossword Cipher. New York: Armada books, 1981.
MLA-čujuhus (9. p.)Keene, Carolyn. The Clue in the Crossword Cipher. Armada books, 1981.
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