Helfrick, A. D. (1977). Modern electronic instrumentation and measurement techniques. Prentice-Hall of India.
Čikaški stil citiranjaHelfrick, Albert D. Modern Electronic Instrumentation and Measurement Techniques. New Delhi: Prentice-Hall of India, 1977.
MLA način citiranjaHelfrick, Albert D. Modern Electronic Instrumentation and Measurement Techniques. Prentice-Hall of India, 1977.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.