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