TY  - BOOK
AU  - Helfrick, Albert D.
TI  - Modern Electronic instrumentation and measurement Techniques
SN  - 9788120307520
U1  - TBB D65e:b6 LO,NO;3 
PY  - 1990///
CY  - New Delhi
PB  - Prentice Hall of india
N1  - Include index & appendix
ER  -