1. Comery, A. L. A factorial study of achievement in West Point courses.Educ. psychol. Meas., 1949,9, 193–209.
2. Dudek, F. The dependence of factorial composition of aptitude tests upon population differences among pilot trainees.Educ. psychol. Meas., 1948,8, 613–633; 1949,9, 95–104.
3. Fruchter, B. The nature of verbal fluency.Educ. psychol. Meas., 1948,8, 33–47.
4. Fruchter, B. Factorial content of right-response and wrong-response scores in a battery of experimental aptitude tests. Unpublished Ph.D. dissertation, University of Southern California, 1948.
5. Guilford, J. P. (Ed.) Printed classification tests. Army Air Forces Aviation Psychology Research Program, Report No. 5, Washington: U. S. Government Printing Office, 1947.