REFERENCES
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- Terman, L. M. and Merrill, M. A.: Measuring Intelligence. Cambridge, Massachusetts, Houghton Mifflin Company, 1937.
- Merrill-Palmer Pre-School Performance Test. Los Angeles, Western Psychological Service, 1931.
- Gesell, A. et al.: The First Five Years of Life. New York, Harper and Brothers, 1940.
- Lillywhite, H.: Doctors' manual of speech disorders. JAMA 167: 850–858, 1958.