Lua APA (7ú heag.)
Helfrick, A. D., & Cooper, W. D. (1990). Modern electronic instrumentation and measurement techniques. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)
Helfrick, Albert D., agus William David Cooper. Modern Electronic Instrumentation and Measurement Techniques. New Delhi: Prentice Hall, 1990.
Lua MLA (9ú heag.)
Helfrick, Albert D., agus William David Cooper. Modern Electronic Instrumentation and Measurement Techniques. Prentice Hall, 1990.
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