APA
UNITED NATIONS E. A. S., UNITED NATIONS E. A. S., . (1992). Commodity trade statistics, 1990. New York: United Nations.
Chicago
UNITED NATIONS ECONOMIC AND SOCIAL, UNITED NATIONS ECONOMIC AND SOCIAL, . 1992. Commodity trade statistics, 1990. New York: United Nations.
Harvard
UNITED NATIONS E. A. S., UNITED NATIONS E. A. S., . (1992). Commodity trade statistics, 1990. New York: United Nations.
MLA
UNITED NATIONS ECONOMIC AND SOCIAL, UNITED NATIONS ECONOMIC AND SOCIAL, . Commodity trade statistics, 1990. New York: United Nations. 1992.
