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.
Atenció: Aquestes cites poden no estar 100% correctes.