Walpole, R. E. (1976). Elementary statistical concepts. Macmillan.
Lua i Stíl Chicago (17ú heag.)Walpole, Ronald E. Elementary Statistical Concepts. Macmillan, 1976.
Lua MLA (9ú heag.)Walpole, Ronald E. Elementary Statistical Concepts. Macmillan, 1976.
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