APA引文

 Lewis, H. (2007).  Are the rich necessary?: Great economic arguments and how they reflect our personal values.  Axios Press.

Trích dẫn kiểu Chicago

 Lewis, Hunter.  Are the Rich Necessary?: Great Economic Arguments and How They Reflect Our Personal Values.  Axios Press, 2007.

MLA引文

 Lewis, Hunter.  Are the Rich Necessary?: Great Economic Arguments and How They Reflect Our Personal Values.  Axios Press, 2007.

警告：这些引文格式不一定是100％准确.