Cita APA

(1974). World energy supplies 1969-1972. New York: United Nations.

Chicago Style Citation

World Energy Supplies 1969-1972. New York: United Nations, 1974.

Cita MLA

World Energy Supplies 1969-1972. New York: United Nations, 1974.

Atenció: Aquestes cites poden no estar 100% correctes.