Gaya APA

Helfrick, W, D, C, ;, A, D. (1985). Electronic instrumentation and measurement techniques (ed. 3). New Delhi: Prentice Hall.

Gaya MLA

Helfrick, William, David, Cooper, ;, Albert, D.. "Electronic instrumentation and measurement techniques". ed. 3 New Delhi: Prentice Hall, 1985. Text.