Não informado. (1971). Educational Media International. International Council for Educational Media.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Educational Media International. London: International Council for Educational Media, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Educational Media International. International Council for Educational Media, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.