1. and , Statistical Methosd in Education and Psychology, Englewood Cliffs, N. J.: Prentice-Hall, Inc., 1970, pp. 9–14.
2. Statistical Methosd in Education and Psychology, Englewood Cliffs, N. J.: Prentice-Hall, Inc., p. 295.
3. Nonparametric Statistics for the Behavioral Sciences, New York: McGraw-Hill Book Company, 1956, p. 104.
4. Belief in the law of small numbers.
5. and by and in Principles of Educational and Psychological Measurement, edited by and Chicago: Rand McNally, 1967.