Harary,Frank  <br/><br/>
Happy Graph Theory 
/ by ,Frank Harary 
 - New Delhi:   Narosa Publishing House;   1969.  
 - 286p.  
<br/><br/><label>ISBN: </label>8185015554 
<br/><br/><label>Dewey Class. No.: </label>511.5  / HAR/H