1. The “A, not B” search error in Piaget's theory of object permanence: Fact or artifact?;Bjork,1979
2. The “A, not B” search error in Piaget's theory of object permanence development: Fact or artifact?;Cummings,1979
3. The search behavior of 12 to 14 month-old infants on a five-choice invisible displacement hiding task;Cummings;Infant Behavior and Development,1981
4. Perseverative errors in search by young infants;Harris;Child Development,1973
5. The construction of reality in the child;Piaget,1954