Babbie, E., Wagner, W. E., & Zaino, J. (2015). Adventure in social research: Data analysis using IBM, SPSS, statistics (9th ed.). SAGE.

Babbie, Earl, William E. Wagner, and Jeanne Zaino. Adventure in Social Research: Data Analysis Using IBM, SPSS, Statistics. 9th ed. Los Angeles: SAGE, 2015.

Babbie, Earl, et al. Adventure in Social Research: Data Analysis Using IBM, SPSS, Statistics. 9th ed. SAGE, 2015.