UNESCO thesaurus : a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social science, culture and communication / comp. by Jean Aitchison. 

 - Paris :  UNESCO,  1977. 
 - 2 v. 
<br/><br/> Monografía 
<br/><br/><label>ISBN: </label>9231041692 
<br/><br/><label>Subjects--Index Terms: </label>Encabezamientos de Materia 
<br/><br/><label>LC Class. No.: </label>C/Z695/U53