United Nations. Statistical Office. (1979). World energy supplies, 1973-1978. United Nations.
Cita Chicago (17th ed.)United Nations. Statistical Office. World Energy Supplies, 1973-1978. New York: United Nations, 1979.
Cita MLA (8th ed.)United Nations. Statistical Office. World Energy Supplies, 1973-1978. United Nations, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.