Não informado. (1957). Annual bulletin of housing and building statistics for Europe. United Nations, Economic Commission for Europe.
Chicago-referens (17:e uppl.)Não informado. Annual Bulletin of Housing and Building Statistics for Europe. Geneva, Suíça: United Nations, Economic Commission for Europe, 1957.
MLA-referens (8:e uppl.)Não informado. Annual Bulletin of Housing and Building Statistics for Europe. United Nations, Economic Commission for Europe, 1957.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.