TY  - BOOK
AU  - Creswell,John W.
TI  - Research design: qualitative, quantitative, and mixed methods approaches 
SN  - 9781412965576 (pbk. )
PY  - 2009///
CY  - Los Angeles
PB  - Sage Publications
KW  - Social sciences
KW  - Research
KW  - Methodology
KW  - Statistical methods
N1  - Includes Index; Includes bibliographical references
ER  -