Horton, Robert L. <br/><br/>
Programmed learning aid for social problems / 
 Social problems. 
Robert L. Horton, Roger H. Hermanson. 
 - xi, 155 páginas ;  26 cm. 
<br/><br/><label>ISBN: </label>0256014833 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Problemas sociales.
<br/><br/><label>LC Class. No.: </label>HN29  / .H8 1975