TY  - BOOK
AU  - Lewis-Beck, Michael S.  .
TI  - Experimental design and methods / 
SN  - 0-8039-5429-8
U1  - B 
PY  - 1993///
CY  - New Delhi : 
PB  - Sage Publications India Pvt. Ltd , 
KW  - Experimental design and methods
ER  -