TY  - BOOK
AU  - Webb,John W.
AU  - Reis,Ronald A.
TI  - Programmable logic controllers: principles and applications 
SN  - 0136794084
AV  - TJ223.P76  .W33 1999
PY  - 1999///
CY  - Upper Saddle River, NJ
PB  - Prentice Hall
KW  - Programmable controllers
ER  -