TY  - BOOK
AU  - Cooper , William David  .
AU  - Helfrick,Albert D  .
TI  - Electrical instrumentation and measurement techniques / 
SN  - 0-87692-413-5
U1  - 621.381548 
PY  - 1991///
CY  - New Delhi : 
PB  - Prentice Hall of India Pvt Ltd. , 
ER  -