Não informado. (1974). Communication and broadcasting. Marconi Communication Systems.
Chicago-Zitierstil (17. Ausg.)Não informado. Communication and Broadcasting. Chelmsford, Inglaterra: Marconi Communication Systems, 1974.
MLA-Zitierstil (8. Ausg.)Não informado. Communication and Broadcasting. Marconi Communication Systems, 1974.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.