TY  - BOOK
AU  - Letwin, R
TI  - Sales management: the marketing magazing
U1  - 658.810 5 
PY  - 1968///
CY  - NBill brothers publicationsew York
PB  - sales management inc
N1  - vol.100 (no.9-11)
vol. 101( no1-6)
ER  -