TY  - BOOK
AU  - Yin Robert K
TI  - Case study research: design and methods
T2  - Applied Social Research Methods Series; Vol.5
U1  - Y:f, M4 
PY  - 1984///
CY  - London
PB  - Sage Publication        
KW  -  Social sciences-research
KW  - Case method
ER  -