Não informado. (1950). Quarterly Bulletin of Steel Statistics for Europe. United Nations, Economic Commission for Europe.
Chicago-Zitierstil (17. Ausg.)Não informado. Quarterly Bulletin of Steel Statistics for Europe. Geneve, Suíça: United Nations, Economic Commission for Europe, 1950.
MLA-Zitierstil (8. Ausg.)Não informado. Quarterly Bulletin of Steel Statistics for Europe. United Nations, Economic Commission for Europe, 1950.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.