APA
United Nations. Economic Commission for Europe (New York), . (1964). Methods and principles for projecting future energy requirements. New York: United Nations.
Chicago
United Nations. Economic Commission for Europe (New York), . 1964. Methods and principles for projecting future energy requirements. New York: United Nations.
Harvard
United Nations. Economic Commission for Europe (New York), . (1964). Methods and principles for projecting future energy requirements. New York: United Nations.
MLA
United Nations. Economic Commission for Europe (New York), . Methods and principles for projecting future energy requirements. New York: United Nations. 1964.