Sewell, C. (2002). Customers for Life (1st.). Crown Business.
芝加哥风格引文Sewell, Carl. Customers for Life. 1st. Crown Business, 2002.
MLA引文Sewell, Carl. Customers for Life. 1st. Crown Business, 2002.
警告：这些引文格式不一定是100％准确.
APA引文