Cabarrubias, Juan. <br/><br/>
Progress in Language Planning: International Perspectives /  

 - 1st ed /  
 - New York :   Mouton Publishers ,   1980 
 - p.383 :  
<br/><br/><label>ISBN: </label>90-279-3388-X 
<br/><br/><label>Dewey Class. No.: </label>Pz7  / M3