1. Aggarwal, J.C., (1991), Educational Research: an Introduction”, New Delhi, Arya Book Depot, 4th revised Edition.
2. Best John, W., (1996), “Research in Education”, New Delhi, Prentice Hall of India, Private Ltd., 7th Edition.
3. Best, J. W. and Kahn, J. V. (2010): Research in Education, Tenth Edition, PHI Learning Private Limited, New Delhi.
4. Garrette, Henry E., (& Woodwarth, R.S.), (1973) “Statistics in Psychology and Education”, Bombay, Vakils, Feffer and Simons Pvt. Ltd.
5. Khan, Mohd. Shariff, (2004) “Educational Research” New Delhi, Ashish Publishing House.