Harary, Frank <br/><br/>
Structural models:  an introduction to the theory of directed graphs 
Frank Harary, Robert Z.Norman and Dorwin Cartwright 
 - New York  John Wiley & Sons.  1965 
 - ix, 415 p.  
<br/><br/> Includes glossary and index.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Graph theory
<br/><br/><label>Dewey Class. No.: </label>511.5  / HAR