TY  - BOOK
AU  - Delens,A.H.R.
TI  - Principles of market research
U1  - 658.8 
PY  - 1959///
CY  - London
PB  - Crosby Luckwood
KW  - Marketing research
KW  - Research industrial
KW  - Test marketing
N1  - Includes index
ER  -