Cita APA (7th ed.)
Helfrick, A. D., & Cooper, W. D. (1990). Modern electronic instrumentation and measurement techniques. Prentice Hall.
Cita Chicago (17th ed.)
Helfrick, Albert D., i William David Cooper. Modern Electronic Instrumentation and Measurement Techniques. New Delhi: Prentice Hall, 1990.
Cita MLA (9th ed.)
Helfrick, Albert D., i William David Cooper. Modern Electronic Instrumentation and Measurement Techniques. Prentice Hall, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.