TY  - BOOK
AU  - Wellman,Barry
AU  - Berkowitz,S.D.
TI  - Social structures: a network approach 
SN  - 0521244412 :
U1  - 301.44 
PY  - 1988///
CY  - Cambridge
PB  - The University Press
KW  - Social structure
KW  - Social networks
N1  - Includes index
ER  -