Johnson, R. R. (1992). Elementary statistics (6th ed.). PWS-Kent Pub. Co.
Lua i Stíl Chicago (17ú heag.)Johnson, Robert Russell. Elementary Statistics. 6th ed. Boston: PWS-Kent Pub. Co, 1992.
Lua MLA (9ú heag.)Johnson, Robert Russell. Elementary Statistics. 6th ed. PWS-Kent Pub. Co, 1992.
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