TY  - BOOK
AU  - Creswell,John W.
TI  - Research design: qualitative, quantitative, and mixed methods approaches 
SN  - 9781506386768
U1  - 300.721 22
PY  - 2018///
CY  - LOS ANGELES
PB  - SAGE PUBLICATIONS : 
KW  - Social sciences
KW  - Research
KW  - Methodology
KW  - Statistical methods
N1  - Includes bibliographical references and index
ER  -