Não informado. (1971). Educational Media International. International Council for Educational Media.
Chicago-referens (17:e uppl.)Não informado. Educational Media International. London: International Council for Educational Media, 1971.
MLA-referens (8:e uppl.)Não informado. Educational Media International. International Council for Educational Media, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.