Não informado. (1968). Commodity trade and price trends. International Bank for Reconstruction and Development.
Citação do estilo Chicago (17ª ed.)Não informado. Commodity Trade and Price Trends. Washington: International Bank for Reconstruction and Development, 1968.
Citação MLA (8ª ed.)Não informado. Commodity Trade and Price Trends. International Bank for Reconstruction and Development, 1968.
警告：这些引文格式不一定是100％准确.