Não informado. (1979). Educational communication and technology. Association for Educational Communications and Technology.
Chicago-referens (17:e uppl.)Não informado. Educational Communication and Technology. Washington: Association for Educational Communications and Technology, 1979.
MLA-referens (8:e uppl.)Não informado. Educational Communication and Technology. Association for Educational Communications and Technology, 1979.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.