ebrary, Inc. (2007). Pocket world in figures (2008 ed.). Economist in association with Profile Books.
芝加哥风格引文ebrary, Inc. Pocket World in Figures. 2008 ed. London: Economist in association with Profile Books, 2007.
MLA引文ebrary, Inc. Pocket World in Figures. 2008 ed. Economist in association with Profile Books, 2007.
警告：这些引文格式不一定是100％准确.