APA
UNITED NATIONS E. A. S. A. (. o., UNITED NATIONS E. A. S. A. (. o., . (1971). Indexes to the international standard industrial classification of all economic activities. New York: UN.
Chicago
UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), . 1971. Indexes to the international standard industrial classification of all economic activities. New York: UN.
Harvard
UNITED NATIONS E. A. S. A. (. o., UNITED NATIONS E. A. S. A. (. o., . (1971). Indexes to the international standard industrial classification of all economic activities. New York: UN.
MLA
UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), UNITED NATIONS ECONOMIC AND SOCIAL AFFAIRS (Department of-), . Indexes to the international standard industrial classification of all economic activities. New York: UN. 1971.
