Keedy, M. L. (1963). A modern introduction to basic mathematics. Addison - Wesley.
Lua i Stíl Chicago (17ú heag.)Keedy, Mervin L. A Modern Introduction to Basic Mathematics. Massachusetts: Addison - Wesley, 1963.
Lua MLA (9ú heag.)Keedy, Mervin L. A Modern Introduction to Basic Mathematics. Addison - Wesley, 1963.
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