Gravetter, F. J., & Gravetter, F. J. a. (1996). Statistics for the behavioral sciences: SPSS manual (4th ed.). West.
Lua i Stíl Chicago (17ú heag.)Gravetter, Fredrick J., agus Fredrick J.[et al] Gravetter. Statistics for the Behavioral Sciences: SPSS Manual. 4th ed. New York: West, 1996.
Lua MLA (9ú heag.)Gravetter, Fredrick J., agus Fredrick J.[et al] Gravetter. Statistics for the Behavioral Sciences: SPSS Manual. 4th ed. West, 1996.
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