Harary, Frank <br/><br/>
Structural models :  an introduction to the theory of directed graphs / 
[by] Frank Harary, Robert Z. Norman [and] Dorwin Cartwright 
 - New York :  Wiley,  1965 
 - ix, 415 p. :  ill. ;  24 cm. 
<br/><br/> Includes index 
<br/><br/>Bibliography: p. 392-395 
<br/><br/><label>ISBN: </label> USD 9.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Mathematical models<br/>Mathematics--Philosophy
<br/><br/><label>Dewey Class. No.: </label>510.83