APA
UNITED NATIONS I. E. A. S., UNITED NATIONS I. E. A. S., . (1989). Commodity trade statistics,1988. New York: United Nations.
Chicago
UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL, UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL, . 1989. Commodity trade statistics,1988. New York: United Nations.
Harvard
UNITED NATIONS I. E. A. S., UNITED NATIONS I. E. A. S., . (1989). Commodity trade statistics,1988. New York: United Nations.
MLA
UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL, UNITED NATIONS INTERNATIONAL ECONOMIC AND SOCIAL, . Commodity trade statistics,1988. New York: United Nations. 1989.
