GetzelsJ. W., & JacksonP. W.The study of giftedness; a multi-dimensional approach. The gifted student. Coop. Res. Monogr., No. 2, U. S. Dept. of Health, Education, and Welfare, Washington, D. C., U. S. Government Printing Office, 1960.
2.
GuilfordJ. P.KettnerN. W., & ChristensenP. R.A factor-analytic study across the domains of reasoning, creativity, and evaluation: II. Administration of tests and analysis of results. Reports from the Psychological Laboratory: No. 16, University of Southern California, March, 1956.
3.
MayF. B.Creative thinking: a factorial study of seventh-grade children, Unpublished doctoral dissertation, University of Wisconsin, 1961.
4.
TorranceE. P.Explorations in creative thinking. Educ., 1960, 81, 216–220.
