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?The principal contributions are the demonstration of reliable indices of activity, presentation of norms on a considerable group of children and the correlation of activity indices with personal and environmental variables. In doing this, the author has well attained the objective of his study.?-American Journal of Psychology
- Format: Inbunden
- ISBN: 9780837180731
- Språk: Engelska
- Antal sidor: 102
- Utgivningsdatum: 1970-04-01
- Förlag: Praeger Publishers Inc