por Friedman, Frank L, 1942- [autor] | Zuluaga R., Eduardo [traductor] | Koffman Elliot B [autor] | Renau Ballester, Ruy [traductor].
por Zbar, Paul B, 1911- [autor] | Rockmaker, Gordon [autor] | Bates, David J [autor] | Renau Ballester, Ruy [traductor].
por Stremler, Ferrel G [autor] | Renau Ballester, Ruy [traductor] | Fajury Añez, Emilio [traductor] | Stremler, Ferrel G. Introduction to communication systems.