TY  - BOOK
AU  - Creswell, JW.
TI  - Research design: qualitative, quantitative, and mixed methods approaches 
SN  - 9781412965569 (cloth)
PY  - 2009///
CY  - Thousand Oaks,
PB  - Sage Publications,
KW  - Public Health
KW  - Research Methodology
N1  - Includes bibliographical references (p. 237-245) and indexes
ER  -