1. Young children's thinking: Understanding of the principle of conservation;Almy,1963
2. Intersensory development in children;Birch;Monogr. Soc. Res. Child Developm.,1963
3. The course of cognitive growth;Bruner;Amer. Psychol.,1964
4. Perception and the representative design of psychological experiments;Brunswik,1956
5. Scope and aspects of the cognitive problem;Brunswik,1957