DRAKE(Frank) & SOBEL(Dava) <br/><br/>
Is anyone out there? The search for extraterrestrial intelligence 

 - New York  Pocket Books  1997 
 - Pbk. xv p. + 272 
<br/><br/><label>ISBN: </label>0-671-01029-8 
<br/><br/><label>Source: </label>596630