TY  - BOOK
AU  - Creswell, John W.
TI  - Research design: qualitative, quantitative, and mixed methods approaches 
SN  - 9781412965576
AV  - H 62 .C74 2009 
PY  - 2009///
CY  - [Place of publication not identifed]
PB  - [publisher not identified]
N1  - Research design : qualitative, quantitative, and mixed methods approaches, Research
ER  -