Smith, K. J. (2001). The nature of mathematics (9th ed.). Brooks/Cole.
Lua i Stíl Chicago (17ú heag.)Smith, Karl J. The Nature of Mathematics. 9th ed. Australia, Pacific Grove, CA: Brooks/Cole, 2001.
Lua MLA (9ú heag.)Smith, Karl J. The Nature of Mathematics. 9th ed. Brooks/Cole, 2001.
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