1.
Science
; 194(4267): 859-60, 1976 Nov 19.
Artigo
em Inglês
| MEDLINE
| ID: mdl-17744190
RESUMO
Behavioral differences between the sexes include methods of carrying books. Females clasp books against their chests; males carry them at their sides. In kindergarten and the first grade, both sexes carry like mature males. Sex-typical carrying appears before adolescence. Behavioral differences seem to be primarily a consequence of morphological differences and social modeling.