Não informado. (1971). Educational Media International. International Council for Educational Media.
Chicago-Zitierstil (17. Ausg.)Não informado. Educational Media International. London: International Council for Educational Media, 1971.
MLA-Zitierstil (8. Ausg.)Não informado. Educational Media International. International Council for Educational Media, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.