1. BEST, J.W. Research in Education, Prentice Hall of India, New Delhi, 1977.
2. BERNARD & FULIMER Principals of Guidance, A basic text, Allied Publications Pvt. Ltd. New York, 1969.
3. GARRETT, HENRY, E. Statistics in Psychology and Education Vakils Feller & Simons Pvt Ltd. Bombay,India,1971
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