APA
UNITED NATIONS I. E. A. S., UNITED NATIONS I. E. A. S., . (1991). Commodity trade statistics, 1989. New York: United Nations.
Chicago
UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL, UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL, . 1991. Commodity trade statistics, 1989. New York: United Nations.
Harvard
UNITED NATIONS I. E. A. S., UNITED NATIONS I. E. A. S., . (1991). Commodity trade statistics, 1989. New York: United Nations.
MLA
UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL, UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL, . Commodity trade statistics, 1989. New York: United Nations. 1991.
