United Nations. Statistical Office. (1979). World energy supplies, 1973-1978. United Nations.
Chicago-viite (17. p.)United Nations. Statistical Office. World Energy Supplies, 1973-1978. New York: United Nations, 1979.
MLA-viite (8. p.)United Nations. Statistical Office. World Energy Supplies, 1973-1978. United Nations, 1979.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.