TY  - BOOK
AU  - Harary, Frank
AU  - Cartwright, Dorwin
AU  - Norman, Robert Z.
TI  - Structural models: An introduction to the theory of directed graphs
U1  - 311.26 
PY  - 1966///
CY  - New York
PB  - John Wiley 
KW  - Sociology
ER  -