APA
UNITED NATIONS E. A. S., UNITED NATIONS E. A. S., . (1968). World energy suppies,1963-1966. New York: United Nations.
Chicago
UNITED NATIONS ECONOMIC AND SOCIAL, UNITED NATIONS ECONOMIC AND SOCIAL, . 1968. World energy suppies,1963-1966. New York: United Nations.
Harvard
UNITED NATIONS E. A. S., UNITED NATIONS E. A. S., . (1968). World energy suppies,1963-1966. New York: United Nations.
MLA
UNITED NATIONS ECONOMIC AND SOCIAL, UNITED NATIONS ECONOMIC AND SOCIAL, . World energy suppies,1963-1966. New York: United Nations. 1968.
