TY  - BOOK
AU  - Creswell,John W.
TI  - Research design: qualitative, quantitative, and mixed methods approaches 
SN  - 9781412965569 (hbk.)
PY  - 2009///
CY  - Thousand Oaks, Calif.
PB  - SAGE Publications
KW  - Social sciences
KW  - Research
KW  - Methodology
KW  - Statistical methods
N1  - Includes bibliographical references : (p. 237-245) and indexes
ER  -