Gehring, R. E. (1978). Basic behavioral statistics. Hougton mifflin.
Lua i Stíl Chicago (17ú heag.)Gehring, Robert E. Basic Behavioral Statistics. Boston: Hougton mifflin, 1978.
Lua MLA (9ú heag.)Gehring, Robert E. Basic Behavioral Statistics. Hougton mifflin, 1978.
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