Não informado. (1964). Labour Education. International Labour Office.
Lua i Stíl Chicago (17ú heag.)Não informado. Labour Education. Geneva, Suíça: International Labour Office, 1964.
Lua MLA (8ú heag.)Não informado. Labour Education. International Labour Office, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.