Sachs, Ignacy. <br/><br/>
Understanding the real economy in all its diversity. 

 - Parˇs-FR :   Ecodevelopment news,   1984. 
 - página 14 
 - Trimestral 
 - No.31 (Dec.1984) 
 - Ecodevelopment news ;   no.31 .
 - Ecodevelopment news. .