Harary, Frank. <br/><br/>
Graph theory / 
by Frank Harary ; with a foreword and an appendix on the Four Colour Theorem by V. Krishnamurthy. 
 - New Delhi :  Narosa Publishing House,  1969. 
 - xi, 286 p. :  il.,  22 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references : p.237-262. 
<br/><br/><label>ISBN: </label>8185015554 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Graph theory.