Dyfyniad APA

(1979). International trade 1978/79. Geneva: General Agreement on tariffs and trade.

Dyfyniad Arddull Chicago

International Trade 1978/79. Geneva: General Agreement on tariffs and trade, 1979.

Dyfyniad MLA

International Trade 1978/79. Geneva: General Agreement on tariffs and trade, 1979.

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