Narlikar, Jayant Vishnu. <br/><br/>
Seven wonders of the cosmos / 
Jayant Vishnu Narlikar. 
 - [S.l.] :  Cambridge University Press,  1999. 
 - 334 p. ;  23 cm. 
<br/><br/><label>ISBN: </label>0521630878 9780521630870 
<br/><br/><label>Dewey Class. No.: </label>520