Cita APA (7th ed.)

Cooper, W., & Helfrick, A. (1985). Electronic instrumentation and measurement techniques (3rd ed.). Prentice-Hall of India.

Cita Chicago (17th ed.)

Cooper, W.D, i A.D Helfrick. Electronic Instrumentation and Measurement Techniques. 3rd ed. New Delhi: Prentice-Hall of India, 1985.

Cita MLA (9th ed.)

Cooper, W.D, i A.D Helfrick. Electronic Instrumentation and Measurement Techniques. 3rd ed. Prentice-Hall of India, 1985.