APA

United Nations Industrial Development Organization, United Nations & Expert group meeting on lead and zinc industries. (1970). Technological developments in lead and zinc production and their sig nificance production and their significance to developing countriesrepo rt. New York: United Nations.

Chicago

United Nations Industrial Development Organization, United Nations and Expert group meeting on lead and zinc industries. 1970. Technological developments in lead and zinc production and their sig nificance production and their significance to developing countriesrepo rt. New York: United Nations.

Harvard

United Nations Industrial Development Organization, United Nations and Expert group meeting on lead and zinc industries. (1970). Technological developments in lead and zinc production and their sig nificance production and their significance to developing countriesrepo rt. New York: United Nations.

MLA

United Nations Industrial Development Organization, United Nations and Expert group meeting on lead and zinc industries. Technological developments in lead and zinc production and their sig nificance production and their significance to developing countriesrepo rt. New York: United Nations. 1970.