Allport, G. W. and Odbert, H. S."Trait Names: A Psycho-lexical Study."Psychological Monograph, XLVII (1936), I-171.
2.
Fehrer, E."Shifts in Scale Values of Attitude Statements as a Function of the Composition of the Scale."Journal of Experimental Psychology , XLIV (1952), 179-189.
3.
Ferguson, L. W.L.O.M.A. Merit Rating Plan: Manual of Directions for Use. New York: Life Office Management Association, 1948.
4.
Helson, H."Adaptation Level as a Basis for a Quantitative Theory of Frames of Reference."Psychological Review, LV ( 1948), 297-313.
5.
Helson, H."Adaptation Level as a Frame of Reference for the Prediction of Psychophysical Data."American Journal of Psychology, LX ( 1947), I-30.
6.
7.
Principle Governing Changes in Hue, Saturation, and Lightness of Non-Selective Samples in Chromatic Illumination."Journal of Experimental Psychology, XXIII (1938 ), 439-376.