And baby makes four : predictors of attachment security among preschool-age first borns during the transition to siblinghood 
 Chicago, EUA 

 - 579-596 
 - 1996 Vol. 67, no. 2, apr. 
 = CHILD DEVELOPMENT 
<br/><br/><label>Encabezamiento--Término de Indización: </label>EDUCACION PREESCOLAR HERMANOS NIÑOS RECIEN NACIDO