Green, S. B., Salkind, N. J., & Akey, T. M. (1997). Using SPSS for Windows: Analyzing and understanding data. Prentice Hall.

Green, Samuel B., Neil J. Salkind, and Theresa M. Akey. Using SPSS for Windows: Analyzing and Understanding Data. Upper Saddle River, N.J.: Prentice Hall, 1997.

Green, Samuel B., et al. Using SPSS for Windows: Analyzing and Understanding Data. Prentice Hall, 1997.