Donnelly. (1987). International economics.
Dyfyniad Arddull ChicagoDonnelly. International Economics. London, Longman, 1987.
Dyfyniad MLADonnelly. International Economics. 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
Donnelly. (1987). International economics.
Dyfyniad Arddull ChicagoDonnelly. International Economics. London, Longman, 1987.
Dyfyniad MLADonnelly. International Economics. 1987.