Littell, M. (2008). Economics: Concepts and choice. McDougal Littell.
芝加哥风格引文Littell, McDougal. Economics: Concepts and Choice. California: McDougal Littell, 2008.
MLA引文Littell, McDougal. Economics: Concepts and Choice. McDougal Littell, 2008.
警告：这些引文格式不一定是100％准确.