TY  - BOOK
AU  - Webb,John W.
TI  - Programmable logic controllers: Principles and applications 
SN  - 0-02-424970-x
AV  - TJ223.P76 W44 1992
PY  - 1992///
CY  - New York
PB  - Merrill ; Toronto, Maxwell macmillan
KW  - Controladores programables
ER  -