Turtledove, H. (2002). Counting up, counting down (first.). Ballantine books.
Chicago-čujuhus (17. p.)Turtledove, Harry. Counting Up, Counting Down. first. New York: Ballantine books, 2002.
MLA-čujuhus (9. p.)Turtledove, Harry. Counting Up, Counting Down. first. Ballantine books, 2002.
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