APA
Helfrick A. D., Cooper W. D., . (1990). Modern electronic instrumentation and measurement techniques. Englewood Cliffs, N.J: Prentice-Hall.
Chicago
Helfrick Albert D, Cooper William D, . 1990. Modern electronic instrumentation and measurement techniques. Englewood Cliffs, N.J: Prentice-Hall.
Harvard
Helfrick A. D., Cooper W. D., . (1990). Modern electronic instrumentation and measurement techniques. Englewood Cliffs, N.J: Prentice-Hall.
MLA
Helfrick Albert D, Cooper William D, . Modern electronic instrumentation and measurement techniques. Englewood Cliffs, N.J: Prentice-Hall. 1990.