Não informado. Statistics of world trade in steel. United Nations, Economic Commission for Europe.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Statistics of World Trade in Steel. New York: United Nations, Economic Commission for Europe.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Statistics of World Trade in Steel. United Nations, Economic Commission for Europe.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.