Hartsfield, Nora. <br/><br/>
Pearls in graph theory :  a comprehensive introduction / 
by Nora Hartsfield, Gerhard Ringel. 
 - Revised and augmented. 
 - Boston, Mass. :  Academic Press,  1994. 
 - x, 249 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references (p. 241-244) and index. 
<br/><br/>Basic graph theory--Colorings of graphs--Circuits and cycles--External problems. 
<br/><br/><label>ISBN: </label>0123285534 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Graph theory.