AU  - Yin,Robert K.
TI  - Case study research :  Design and Mehthods / 
T2  - Applied Social Research Methods Series-Vol.5, 
SN  - 0809356622
U1  - 300.186 
PY  - 1994///
CY  - London : 
PB  - Sage Publications , 
KW  - Case Method
KW  - Social Sciences -Research-Methodology
ER  -