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