TY  - BOOK
AU  - Creswell John W.
TI  - Research design :  Qualitative quantitative and mixed methods approaches
SN  - 9781455226101
U1  - Sigma:f, P9;Q4 
PY  - 2014///
CY  - Los Angeles
PB  - Angles Sage UK     
KW  - SOCIAL SCIENCES
ER  -