Dressel, P. L. and Mayhew, L. B.General Education: Exploration in Evaluation. American Council on Education, 1954.
2.
DuBois, P. H.Multivariate Correlational Analysis . New York: Harper & Brothers , 1957.
3.
DuBois, P. H. and Manning, W. H. "Methods of Research in Technical Training." Technical Report No. 3, ONR Contract No. Nonr-816(02). St. Louis : Washington University, 1957 .
4.
Lord, F. M. "The Measurement of Growth." EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, XVI (1956), 421-437.
5.
Manning, W. H. and DuBois, P. H. "Gain in Proficiency as a Criterion in Test Validation ." Technical Report No. 4, ONR Contract No. Nonr-816(02). St. Louis: Washington University, 1957.
6.
Thomson, G. H. "A Formula to Correct for the Effect of Errors of Measurement on the Correlation of Initial Values with Gains." Journal of Experimental Psychology , VII (1924), 321-324.
7.
Zieve, L. "Note on the Correlation of Initial Scores with Gains." Journal of Educational Psychology , XXXI (1940), 391-394.