TY  - BOOK
AU  - Belson, William A
AU  - Belson, William A
TI  - Design and understanding fo servey questions
SN  - 0 07 092780 4 # 0-566-00420-8
U1  - 001.433 
PY  - 1981/// # 1971
CY  - New York # England
PB  - Gower Publishing Company # McGraw Hill
ER  -