Britannica yearbook of science and the future, 1981.  [electronic resource]  

 - Chicago, IL,  Encyclopaedia Britannica,  1980. 
 - 445 p. 
<br/><br/><label>ISBN: </label>0852293755 9780852293751 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Enciclopedias estrangeiras.
<br/><br/><label>Dewey Class. No.: </label>505