TY  - BOOK
AU  - Creswell,John W.
TI  - Research design:  : qualitative, quantitative, and mixed methods approaches
SN  - 978-1-4129-6557-6
AV  - H62.C6963 
PY  - 2009///
CY  - London
PB  -  : SAGE Publication
KW  - Social science-Research-Methodology
KW  - Social sciences-Statistical methods
N1  - Include bibliographical references and index
ER  -