(1973). A survey of video distribution systems for educational purposes. National Council for Educational Technology.
Chicago-Zitierstil (17. Ausg.)A Survey of Video Distribution Systems for Educational Purposes. London: National Council for Educational Technology, 1973.
MLA-Zitierstil (9. Ausg.)A Survey of Video Distribution Systems for Educational Purposes. National Council for Educational Technology, 1973.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.