- Bellugi, Ursula, 1931- (1)
- Brown, Roger William, 1925- (1)
- Camaioni, Luigia (1)
- Conference on First-Language Acquisition (1)
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- Hinde, Robert A., 1923- (1)
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- Piaget, Jean, 1896-1980 (1)
- Social Science Research Council (U.S.). Committee on Intellective Processes Research (1)
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