TY  - BOOK
AU  - Creswell,John W.
TI  - Research design: qualitative, quantitative, and mixed methods approaches 
SN  - 9781412965569 (cloth)
AV  - H62 .C6963 2009
U1  - 300.72 22
PY  - 2009///
CY  - Thousand Oaks
PB  - Sage Publications
N1  - Bibliogr.: p. 237-245
ER  -