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…showed last 75 words of 1618 total…-281, Plenum Press, New York Harkness S., and Super C.M. 1985 The cultural context of gender segregation in childrens peer groups. Child development, 56, 219-224 Butterworth G. and Harris M., 1994. Principles of Developmental Psychology, Lawrence Erlbaum Associates, Hove. Smith A.L. 1999 Perceptions of peer relationships and Physical activity participation in early Adolescence. Journal of Sport and Exercise Psychology, 21, 329-350 Piaget J. 1952 The origins of intelligence in children. Harcourt Brace. New York (first published in French in 1936