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20. SCHORN, M. "Zur Psychologie des Frühbegabten Kindes." Zeitschrift für Psychologie, pages 105, 302-316 (1928).

21. SPEARMAN, G. "General Intelligence Objectively Determined and Measured." American Journal of Psychology, Vol. 15, pages 201-293 (1904).

22. STEDMAN, L. M. Education of Gifted Children. World Book Company, Yonkers-on-Hudson, New York; 1924.

23. TERMAN, LEWIS M. "A New Approach to the Study of Genius." Psychological Review, Vol. 29, pages 310-318 (1922).

24. ——— The Measurement of Intelligence. Houghton Mifflin Company, Boston; 1916.

25. TERMAN, LEWIS M., and FENTON, J. C. "Preliminary Report on a Gifted Juvenile Author." Journal of Applied Psychology, Vol. 5, pages 163-178 (1921).

26. ——— et al. Mental and Physical Traits of a Thousand Gifted Children. Genetic studies of Genius: Vol. 1. Stanford University Press, Stanford University, California; 1925.

27. ——— et al. Ibid., Genetic Studies of Genius: Vol. 3. Stanford University Press, Stanford University, California; 1930.

28. THORNDIKE, E. L. An Introduction to the Theory of Mental and Social Measurements. Science Press, New York; 1904.