Book Reviews : R. Darrell Bock and Lyle V. Jones. The Measurement and Prediction of Judgment and Choice. San Francisco: Holden-Day,1968. 370 pp. $13.75

Coombs, C. H. A Theory of Data. New York: Wiley, 1964 .

Gulliksen, H. , and Tukey, J. W. Reliability for the law of comparative judgment." Psychometrika, 1958, 23, 95-110.

Tucker, L. R. Systematic differences between individuals in perceptual judgments. In G. L. Bryan , and M. W. Shelly (Eds.), Human Judgments and Optimality. New York: Wiley, 1964. Pp. 85-98.