APA
UNITED NATIONS E. A. S. D., UNITED NATIONS E. A. S. D., . (1993). Commodity trade statistics,1991. New York: United Nations.
Chicago
UNITED NATIONS ECONOMIC AND SOCIAL DEVELOPMENT, UNITED NATIONS ECONOMIC AND SOCIAL DEVELOPMENT, . 1993. Commodity trade statistics,1991. New York: United Nations.
Harvard
UNITED NATIONS E. A. S. D., UNITED NATIONS E. A. S. D., . (1993). Commodity trade statistics,1991. New York: United Nations.
MLA
UNITED NATIONS ECONOMIC AND SOCIAL DEVELOPMENT, UNITED NATIONS ECONOMIC AND SOCIAL DEVELOPMENT, . Commodity trade statistics,1991. New York: United Nations. 1993.
