International Monetary Fund. (1988). World Economic and Financial Surveys, Primary Commodities, 1988: Primary Commodities. International Monetary Fund.
芝加哥风格引文International Monetary Fund. World Economic and Financial Surveys, Primary Commodities, 1988: Primary Commodities. Washington, D.C.: International Monetary Fund, 1988.
MLA引文International Monetary Fund. World Economic and Financial Surveys, Primary Commodities, 1988: Primary Commodities. International Monetary Fund, 1988.
警告：这些引文格式不一定是100％准确.