References
- Ary D., Jacobs L. C., Razavieh A. Introduction to Research in Education. Rinehart & Winston, New York, Holt 1972; 215–262
- Garrett, Henry E. Statistics in Psychology and Education, 6th Edn. Longman, London 1967; 279–295
- Hodges W. Logic. Penguin, Middlesex 1977; 166–167
- Lindquist E. F. Educational Measurement. George Banta, Wisconsin 1950; 194–195, 347–351; 365–368
- Morley D. Medical education in the developing world–new approaches needed. Medical Teacher 1979; 1: 258–261
- Van Dalen D. B. Understanding Educational Research. McGraw-Hill, New York 1962; 221–247