Menninger, K. W. (1992). Number words and number symbols: A cultural history of numbers. Dover.
Chicago-čujuhus (17. p.)Menninger, Karl W. Number Words and Number Symbols: A Cultural History of Numbers. Nueva York: Dover, 1992.
MLA-čujuhus (9. p.)Menninger, Karl W. Number Words and Number Symbols: A Cultural History of Numbers. Dover, 1992.
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