TY  - BOOK
AU  - Creswell, John W
TI  - Research design: qualitative,quantitative and mixed methods approaches
SN  - 9781412965576
U1  - 001.42 
PY  - 2009///
CY  - Los Angeles
PB  - SAGE
KW  - RESEARCH
KW  - SOCIAL SCIENCES
KW  - STATISTICAL METHODS
ER  -