Não informado. (1967). Educational television international. Centre for Educational Television Overseas.
Chicago-Zitierstil (17. Ausg.)Não informado. Educational Television International. London: Centre for Educational Television Overseas, 1967.
MLA-Zitierstil (8. Ausg.)Não informado. Educational Television International. Centre for Educational Television Overseas, 1967.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.