Chartrand, Gary; et al. <br/><br/>
Textbooks in Mathematics: Graphs and Digraphs  

 - 6th Edition 
 - Boca Raton  CRC Press  2016 
 - 640 p 
<br/><br/><label>ISBN: </label>9781498735766 
<br/><br/><label>Dewey Class. No.: </label>511.5  C486