Pitkänen, Lea <br/><br/>
A descriptive model of aggression and nonaggression with applications to children's behaviour 

 - Jyväskylä (Fin.) :  Jyväskylän Yliopisto,  1969. 
 - 208 páginas:  ilustraciones 
 - Jyväskylä studies in education, psychology and social research ;  19 .
<br/><br/>Incluye bibliografía. 
<br/><br/><label>Encabezamiento--Tema: </label><br/>Agresión<br/>Conducta infantil