TY  - BOOK
AU  - Creswell,John W
TI  - Research design  : qualitative quantitative and mixed methods approaches
SN  - 0761924418
AV  - H62 .C6963 2003
PY  - 2003///
CY  - USA  
PB  - Sage Pub, 
N1  - Incluye referencias bibliograficas
ER  -