Truman, David B. <br/><br/>
The governmental process :  political interests and public opinion. 

 - 7ª ed. 
 - New York :  Alfred A. Knopf,  1960. 
 - 544 p. 
<br/><br/> Selected bibliography: 537-44. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>GRUPOS DE INTERES