TY  - BOOK
AU  - Harder,Theodor
TI  - Introduction to mathematical models in market and opinion research with practical applications, computing procedures and estimates of computing requirements
U1  - 658.83 
PY  - 1969///
CY  - The Hague
PB  - Mouton
KW  - Marketing research
KW  - Mathematical models
KW  - Public opinion polls
N1  - Bibliography: p. 193-194
ER  -