1. 1. Bernstein, Allen L. , “An Estimate of the Accuracy (Objectivity) of Nominal Category Coding” MOREL monograph, November, 1968.
2. 2. Flanders, Ned A. , “Teacher Influences, Pupil Attitudes and Achievement.” USOE Cooperative Research Monograph No. 12, (OE-25040).
3. 3. Guba, Egon and Clark, David , “An Examination of Potential Change Roles in Education.” Paper presented at the NEA Conference on Innovation in Planning School Curriculum, Airlie House, Virginia, October, 1965.
4. An Analysis of Teacher's Managerial Techniques.;Kounin;Psychology in the Schools,1967