WALKER, H. M. (1969). Elementary statistical methods. Holt, Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)WALKER, Helen M. Elementary Statistical Methods. New York: Holt, Rinehart and Winston, 1969.
Lua MLA (9ú heag.)WALKER, Helen M. Elementary Statistical Methods. Holt, Rinehart and Winston, 1969.
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