Eysenck, H.J. , and Crown, S."An Experimental Study in Opinion-Attitude Methodology."International Journal of Opinion and Attitude Research, III (1949 ), 47-86.
2.
Ferguson, G.A."The Factorial Interpretation of Test Difficulty."Psychometrika, VI (1941) 343-329.
3.
Festinger, L."The Treatment of Qualitative Data by 'Scale Analysis'."Psychological Bulletin, XLIV (1947), 149-161.
4.
Gage, N.L."Scaling and Factorial Design in Opinion Poll Analysis."Purdue University Studies in Higher Education, LXI, (1947).
5.
Guttman, L."Scale Intensity Analysis for Attitude, Opinion, and Achievement."New Methods in Applied Psychology, edited by G. A. Kelly. College Park: University of Maryland, 1947.
6.
Guttman, "On Smith's Paper on 'Randomness of Error' in Reproducible Scales."EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, XIII, (1953), 505-511.
7.
Smith, R.G., Jr."'Randomness of Error' in Reproducible Scales."EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, XI (1951), 587-596.
8.
Stouffer, S., et al. Measurement and Prediction,Princeton, New Jersey: Princeton University Press , 1950.