Não informado. (1989). Educational Technology Research and Development. Association for Educational Communications and Technology.
Lua i Stíl Chicago (17ú heag.)Não informado. Educational Technology Research and Development. Washington: Association for Educational Communications and Technology, 1989.
Lua MLA (8ú heag.)Não informado. Educational Technology Research and Development. Association for Educational Communications and Technology, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.