TY  - BOOK
AU  - Creswell John W
TI  - Research design: qualitative, quantitative, and mixed methods approaches
SN  - 0-7619-2441-8
U1  - 300.72 
PY  - 2003///
CY  - California
PB  - Sage
KW  - Social sciencer-research-methodology
KW  - Social sciences-statistical methods
ER  -