Não informado. (1971). British Journal of Educational Technology. National Council for Educational Technology.
Lua i Stíl Chicago (17ú heag.)Não informado. British Journal of Educational Technology. London: National Council for Educational Technology, 1971.
Lua MLA (8ú heag.)Não informado. British Journal of Educational Technology. National Council for Educational Technology, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.