World Bank. (1989). Price prospects for major primary commodities, 1988-2000. World Bank.
芝加哥风格引文World Bank. Price Prospects for Major Primary Commodities, 1988-2000. Washington, D.C.: World Bank, 1989.
MLA引文World Bank. Price Prospects for Major Primary Commodities, 1988-2000. World Bank, 1989.
警告：这些引文格式不一定是100％准确.