TY  - BOOK
AU  - Creswell, John W.
TI  - Research design: qualitative, quantitative, and mixed methods approaches [4th ed.]
SN  - 9781452226101
U1  - 300.72 
PY  - 2014///
CY  - Los Angeles
PB  - Sage
KW  - Social science -- Statistical methods
KW  - Social science -- Research -- Methodology
ER  -