TY  - BOOK
AU  - Wellman,Barry
AU  - Berkowitz,Stephen D.
TI  - Social structures: a network approach 
SN  - 0521244412
U1  - 305 22
PY  - 1988///
CY  - Cambridge [Cambridgeshire], New York
PB  - Cambridge University Press
KW  - Social structure
KW  - Social networks
N1  - Includes bibliographies and index
ER  -