Gaur, A. S., & Gaur, S. S. (2009). Statistical methods for practice and research: A guide to data analysis using SPSS (2nd ed.). Response.

Gaur, Ajai S., and Sanjaya S. Gaur. Statistical Methods for Practice and Research: A Guide to Data Analysis Using SPSS. 2nd ed. Los Angeles ; New Delhi: Response, 2009.

Gaur, Ajai S., and Sanjaya S. Gaur. Statistical Methods for Practice and Research: A Guide to Data Analysis Using SPSS. 2nd ed. Response, 2009.