International Monetary Fund. (1987). Primary Commodities: May 1987. International Monetary Fund.
芝加哥风格引文International Monetary Fund. Primary Commodities: May 1987. Washington, D.C.: International Monetary Fund, 1987.
MLA引文International Monetary Fund. Primary Commodities: May 1987. International Monetary Fund, 1987.
警告：这些引文格式不一定是100％准确.