Gagliardi, M. Robert. Introduction to communications engineering/ Robert M. Gagliardi - New York: JOHN WILEY AND SONS, c1978. - xi,508 p.: 23 cm. Includes index. English ISBN: 0471030996 Subjects--Topical Terms: CommunicationsCommunication EngneeringTelecommunication Dewey Class. No.: 621.38/GAI