Não informado. (1969). Research in Education. Manchester University Press.
Lua i Stíl Chicago (17ú heag.)Não informado. Research in Education. Manchester, Inglaterra: Manchester University Press, 1969.
Lua MLA (8ú heag.)Não informado. Research in Education. Manchester University Press, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.