APA
Cooper W.D, Helfrick A.D, . (1991). Electronics Instrumentation and Measurement Techniques. New Delhi: P.H.I.
Chicago
Cooper W.D, Helfrick A.D, . 1991. Electronics Instrumentation and Measurement Techniques. New Delhi: P.H.I.
Harvard
Cooper W.D, Helfrick A.D, . (1991). Electronics Instrumentation and Measurement Techniques. New Delhi: P.H.I.
MLA
Cooper W.D, Helfrick A.D, . Electronics Instrumentation and Measurement Techniques. New Delhi: P.H.I. 1991.