Não informado. (1991). Journal of the Learning Sciences. Lawrence Erlbaum Associates.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of the Learning Sciences. Mahwah, NJ: Lawrence Erlbaum Associates, 1991.
Lua MLA (8ú heag.)Não informado. Journal of the Learning Sciences. Lawrence Erlbaum Associates, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.