Gravetter, F. J., & Wallnau, L. B. (2013). Statistics for the behavioral sciences (9th ed.). Wadsworth Cengage Learning.
Cita Chicago (17th ed.)Gravetter, Frederick J., i Larry B. Wallnau. Statistics for the Behavioral Sciences. 9th ed. Belmont, CA: Wadsworth Cengage Learning, 2013.
Cita MLA (8th ed.)Gravetter, Frederick J., i Larry B. Wallnau. Statistics for the Behavioral Sciences. 9th ed. Wadsworth Cengage Learning, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.