Zechmeister, E. B. (1997). A practical introduction to research methods in psychology (3rd. ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Zechmeister, Eugene B. A Practical Introduction to Research Methods in Psychology. 3rd. ed. New York: McGraw-Hill, 1997.
Lua MLA (9ú heag.)Zechmeister, Eugene B. A Practical Introduction to Research Methods in Psychology. 3rd. ed. McGraw-Hill, 1997.
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