Toward adolescence :  the middle school years / 
by the Yearbook Committee and Associated Contributors ; ed. by Mauritz Johnson. 
 - Chicago (E.U.A.) :  NSSE,  1980. 
 - 338 p. 
 - Yearbook of the National Society for the Study of Education ;  v.79, t.l .
<br/><br/><label>Encabezamiento--Tema: </label><br/>Psicología del adolescente