Dyfyniad APA

United Nations. Statistical Office. (1979). World energy supplies, 1973-1978. United Nations.

Dyfyniad Arddull Chicago

United Nations. Statistical Office. World Energy Supplies, 1973-1978. New York: United Nations, 1979.

Dyfyniad MLA

United Nations. Statistical Office. World Energy Supplies, 1973-1978. United Nations, 1979.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.