Hershberger, W. D. Principles of communication systems / W. D. Hershberger - New York : Prentice-Hall, c1955. - ix, 253 p. ; ill., figs. ; 22 cm. - Prentice-Hall electrical engineering series . Includes index. ISBN: LCCN: Subjects--Topical Terms: Telecommunication LC Class. No.: TK5101 / .H43 1955 Dewey Class. No.: 621.38 / H572p