Rivalry in Anglo-American and Mexican children of two ages.
D000367:Age Factors; D000374:Aggression; D002648:Child; D002657:Child Development; D002668:Child Rearing; D002675:Child, Preschool; D003163:Competitive Behavior; D003431:Cross-Cultural Comparison; D005006:Ethnicity; D005260:Female; D006801:Humans; D008297:Male; D010379:Peer Group; D011336:Probability; D012737:Sex Factors; D014481:United States