por 3G E-learning (Firma comercial) [editor].
por Helfrick, Albert D [autor] | Cooper, William David [autor] | Perez Gutierrez, David [traductor] | Helfrick, Albert D. Modern electronic instrumentation and measurement techniques.
por Shukla, SachchidaNand [autor].
por Bolton, W. (William), 1933- [autor].
por Helfrick, Albert D [autor] | Cooper, William David [autor].