Gravetter, F. J., & Wallnau, L. B. (1996). Statistics for the behavioral sciences: A first course for students of psychology and education (4th ed.). West.

Gravetter, Fredrick J., and Larry B. Wallnau. Statistics for the Behavioral Sciences: A First Course for Students of Psychology and Education. 4th ed. New York: West, 1996.

Gravetter, Fredrick J., and Larry B. Wallnau. Statistics for the Behavioral Sciences: A First Course for Students of Psychology and Education. 4th ed. West, 1996.