APA
United Nations Industrial Development Organization, United Nations Industrial Development Organization, . (1993). Consultation on downstream petrochemical industrie. Austria: United Nations.
Chicago
United Nations Industrial Development Organization, United Nations Industrial Development Organization, . 1993. Consultation on downstream petrochemical industrie. Austria: United Nations.
Harvard
United Nations Industrial Development Organization, United Nations Industrial Development Organization, . (1993). Consultation on downstream petrochemical industrie. Austria: United Nations.
MLA
United Nations Industrial Development Organization, United Nations Industrial Development Organization, . Consultation on downstream petrochemical industrie. Austria: United Nations. 1993.