Dougles, A. (1970). Ideas in mathematics. W. B. Saunders.
Lua i Stíl Chicago (17ú heag.)Dougles, Avron. Ideas in Mathematics. Philadelphia, PA: W. B. Saunders, 1970.
Lua MLA (9ú heag.)Dougles, Avron. Ideas in Mathematics. W. B. Saunders, 1970.
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