Chartrand, Gary <br/><br/>
Graphs & digraphs / 
 Graphs and digraphs 
Gary Chartrand, Linda Lesniak,  Ping Zhang 
 - 5th ed. 
 - Boca Raton, FL :  Chapman and Hall/CRC,  2011 
 - xii, 586 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781439826270 (hardback) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Graph theory<br/>Directed graphs<br/>MATHEMATICS / Combinatorics<br/>COMPUTERS / Operating Systems / General<br/>MATHEMATICS / Advanced