Não informado. (1971). British Journal of Educational Technology. National Council for Educational Technology.
Citação do estilo Chicago (17ª ed.)Não informado. British Journal of Educational Technology. London: National Council for Educational Technology, 1971.
Citação MLA (8ª ed.)Não informado. British Journal of Educational Technology. National Council for Educational Technology, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.