TY  - BOOK
AU  - Webb,John W.
AU  - Reis, Ronald A.
TI  - Programmable logic controllers : : principles and applications 
SN  - 9788120323087
U1  - 629.89 23
PY  - 2003///
CY  - New Delhi
PB  - PHI Learning Pvt Ltd
KW  - Programmable controllers
ER  -