Não informado. Handbook of International Trade Development Statistics. United Nations Conference on Trade and Development.
Citação do estilo Chicago (17ª ed.)Não informado. Handbook of International Trade Development Statistics. Geneva, Suíça: United Nations Conference on Trade and Development.
Citação MLA (8ª ed.)Não informado. Handbook of International Trade Development Statistics. United Nations Conference on Trade and Development.
警告：这些引文格式不一定是100％准确.