title: External control expectancies among disadvantaged children at preschool age.
mesh_terms: D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D003467:Cultural Deprivation; D005260:Female; D006801:Humans; D007389:Internal-External Control; D008297:Male; D044469:Racial Groups; D012054:Reinforcement, Psychology; D012649:Self Concept; D012923:Social Class; D014481:United States; D014490:United States Office of Economic Opportunity