On air : methods and meanings of radio / Martin Shingler and Cindy Wieringa. Shingler, Martin 1965- Wieringa, Cindy. Radio broadcasting History. PN1991.2 .S55 1998 791.4409 21 SHO Includes bibliographical references and index. London : New York : Arnold, 1998. 1998. 1998 Text xv, 174 p. : eng