TY  - BOOK
AU  - Creswell,John W
TI  - Research design: qualitative, quantitative, and mixed methods approaches 
SN  - 9781452226095
AV  - H62 C923 2014
PY  - 2014///
CY  - Thousand Oaks
PB  - SAGE Publications
KW  - Social sciences
KW  - Methodology
KW  - Statistical methods
N1  - Includes bibliographical references (p. 251-260) and indexes
ER  -