TY  - BOOK
AU  - Cochran William G.
TI  - Sampling techniques
SN  - 9788126515240 (pbk)
U1  - Sigma:f, N9 
PY  - 1999///
CY  - New York
PB  - John Wiley and Sons USA   
KW  - RESEARCH METHODS - SAMPLING
ER  -