Roddy, Dennis, 1931- Electronic communications [Book] / by Dennis Roddy, John Coolen. - 4th ed. - New Delhi : Pearson Education (Sigapore), c1995. - ix, 820 p. : ill. ; 26 cm. Includes index. All. ISBN: 8129701065 Subjects--Topical Terms: Telecommunication.Electronic communications--engineering. Dewey Class. No.: 621.382