International directory of new and renewable energy information sources and research centres. 

 - 2a ed. 
 - París :  UNESCO,  1986. 
 - 661 p. 
<br/><br/><label>ISBN: </label>9231022989 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>OC 061.2: 620.91 (100 )=20 "1986" INT.