Não informado. (1957). Annual bulletin of housing and building statistics for Europe. United Nations, Economic Commission for Europe.
Lua i Stíl Chicago (17ú heag.)Não informado. Annual Bulletin of Housing and Building Statistics for Europe. Geneva, Suíça: United Nations, Economic Commission for Europe, 1957.
Lua MLA (8ú heag.)Não informado. Annual Bulletin of Housing and Building Statistics for Europe. United Nations, Economic Commission for Europe, 1957.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.