Gravetter, frederick J. (2014). Essentials of statistics for the behavioral science 8th ed.. Wadsworth Cengage Learning.
Gravetter, frederick J. Essentials of statistics for the behavioral science 8th ed.. Wadsworth Cengage Learning, 2014.
Gravetter, frederick J., "Essentials of statistics for the behavioral science 8th ed.," Wadsworth Cengage Learning, 2014.