1. Einstellung rigidity in children;Cunningham;J. exp. child Psychol.,1965
2. Verbal and nonverbal learning in children including those with hearing losses;Gaeth,1963
3. Verbal learning in children;Keppel;Psychol. Bull.,1964
4. Response hierarchies in paired-associate learning;Newman,1963
5. Logic and psychology;Piaget,1957