Não informado. (1971). Industrial Development Abstracts. United Nations, Industrial Development Organization.
Citação do estilo Chicago (17ª ed.)Não informado. Industrial Development Abstracts. New York: United Nations, Industrial Development Organization, 1971.
Citação MLA (8ª ed.)Não informado. Industrial Development Abstracts. United Nations, Industrial Development Organization, 1971.
警告：這些引文格式不一定是100％准確.