TY  - BOOK
AU  - Creswell,John W.
AU  - Creswell,J.David
TI  - Research design: qualitative, quantitative, and mixed methods approaches 
SN  - 9781506386768
U1  - 300.721 23   
PY  - 2018///
CY  - Thousand Oaks, California
PB  - SAGE
KW  - Social sciences
KW  - Research
KW  - Methodology
KW  - Statistical methods
N1  - Includes bibliographical references and indexes
ER  -