TY  - BOOK
AU  - Creswell, John W.
TI  - Research design: quantitative, qualitative and mixes methods approaches 
SN  - 9788132107484
U1  - 001.42 
PY  - 2009///
CY  - London
PB  - Sage
KW  - Knowledge
KW  - Research
KW  - Research methods
KW  - Research design
ER  -