TY  - GEN
AU  - Creswell, John W.
TI  - Research design: qualitative, quantitative and mixed methods approaches
SN  - 9781412965576
U1  - 300.72 
PY  - 2009///
CY  - Los Angeles
PB  - Sage
KW  - RESEARCH METHODS
KW  - SOCIAL RESEARCH
ER  -