TY  - BOOK
AU  - Bales Robert Freed
TI  - Social interaction systems :  Theory and measurement   
SN  - 0765808722
U1  - Y0aS, P1 
PY  - 2001///
CY  - New Brunswick 
PB  - Transaction Publishers        
N1  - Bibliography : P 341-366; Appendix : P 305-340
ER  -