Não informado. (1957). Annual bulletin of housing and building statistics for Europe. United Nations, Economic Commission for Europe.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Annual Bulletin of Housing and Building Statistics for Europe. Geneva, Suíça: United Nations, Economic Commission for Europe, 1957.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Annual Bulletin of Housing and Building Statistics for Europe. United Nations, Economic Commission for Europe, 1957.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.