TY  - BOOK
AU  - Creswell, John W.
TI  - Research design : Qualitative, quantitative and mixed methods approach
SN  - 9781412965576
U1  - 300.72 
PY  - 2002///
CY  - London
KW  - Education-Research
N1  - 1.Preliminary considerations                   2.Designing research
ER  -