TY  - BOOK
AU  - Henry, Gasry T
TI  - Practical sampling V .21
SN  - 0  8039  2959  5
U1  - 001 .42 
PY  - 1990///
CY  - Newbury
PB  - Sage Publications
KW  - research
KW  - Sampling
KW  - social surveys
ER  -