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2. Über die geistige Entwicklung des Kindes;Aebli,1963
3. Objective versus perceived age differences in personality: How do adolescents, adults, and older people view themselves?;Ahammer;Journal of Gerontology,1972
4. A general test for trend;Alexander;Psychological Bulletin,1946
5. Young children's thinking: Studies of some aspects of Piaget's theory;Almy,1966