Não informado. (1971). Industrial Development Abstracts. United Nations, Industrial Development Organization.
Chicago-referens (17:e uppl.)Não informado. Industrial Development Abstracts. New York: United Nations, Industrial Development Organization, 1971.
MLA-referens (8:e uppl.)Não informado. Industrial Development Abstracts. United Nations, Industrial Development Organization, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.