TY  - BOOK
AU  - Yin,Robert K.
TI  - Case study research: design and methods 
U1  - 300/.7/22 21 ed.
PY  - 2003///
CY  - Thousand Oaks, Calif.
PB  - Sage Publications
KW  - Social sciences
KW  - Research
KW  - Methodology.
ER  -