Littell, M. (2008). McDougal Littell economics: Concepts and choices. McDougal Littell.
芝加哥风格引文Littell, McDougal. McDougal Littell Economics: Concepts and Choices. Evanston, Ill.: McDougal Littell, 2008.
MLA引文Littell, McDougal. McDougal Littell Economics: Concepts and Choices. McDougal Littell, 2008.
警告：这些引文格式不一定是100％准确.