TY  - BOOK
AU  - Creswell,John W.
TI  - Research design: qualitative, quantitative, and mixed method approaches
SN  - 97881321078484
U1  - 300.72 
PY  - 2009///
CY  - Thousand Oaks, Calif.
PB  - Sage Publications
KW  - Social sciences
KW  - Social sciences-Research
ER  -