Shell Ellen Ruppel. (2009). Cheap: High Cost of Discount Culture. Penguin Books.
芝加哥风格引文Shell Ellen Ruppel. Cheap: High Cost of Discount Culture. Penguin Books, 2009.
MLA引文Shell Ellen Ruppel. Cheap: High Cost of Discount Culture. Penguin Books, 2009.
警告：这些引文格式不一定是100％准确.