Helfrick, A. D., & Cooper, W. D. (1990). Modern electronic instrumentation and measurement techniques. Prentice Hall.
Chicago-čujuhus (17. p.)Helfrick, Albert D., juo William D. Cooper. Modern Electronic Instrumentation and Measurement Techniques. New Jersey: Prentice Hall, 1990.
MLA-čujuhus (9. p.)Helfrick, Albert D., juo William D. Cooper. Modern Electronic Instrumentation and Measurement Techniques. Prentice Hall, 1990.
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