Chartrand, Gary <br/><br/>
Graphs & digraphs / 
 Graphs and digraphs 
Gary Chartrand, Linda Lesniak and Ping Zhang 
 - 6th ed. 
 - Boca Raton, FL :  CRC Press,  2016 
 - xii, 628 p. :  ill. ;  24 cm. 
 - Textbooks in mathematics .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781498735766 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Graph theory<br/>Directed graphs