TY  - BOOK
AU  - Harary,Frank
AU  - Norman,Robert Z.
AU  - Cartwright,Dorwin
TI  - Structural models: an introduction to the theory of directed graphs
AV  - H61 .H287 1965
PY  - 1965///]
CY  - New York
PB  - Wiley
KW  - Social sciences
ER  -