@article {310941, title = {Mirror self-image reactions before age two.}, journal = {Dev Psychobiol}, volume = {5}, year = {1972}, pages = {297-305}, keywords = {Age Factors, Child Development, Child, Preschool, Discrimination (Psychology), Face, Female, Humans, Infant, Male, Self Concept, Visual perception}, issn = {0012-1630}, doi = {10.1002/dev.420050403}, author = {Amsterdam, B} }