Não informado. Statistics of Foreign Trade. Organization for Economic Co-operation and Development.
Citação do estilo Chicago (17ª ed.)Não informado. Statistics of Foreign Trade. Paris: Organization for Economic Co-operation and Development.
Citação MLA (8ª ed.)Não informado. Statistics of Foreign Trade. Organization for Economic Co-operation and Development.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.