8Jim Sellers, Arthur Hughes. RFM Analysis: A New Approach to a Proven Technique[ DB/OL] . www. relationshipmktg. com/FreeArticles/rmr017. pdf.
9Arthur Middleton Hughes. Making Your Database Pay Off Using Recency Frequency and Monetary Analysis [ DB/OL ] . http://www. dbmarketing. com/articles/Art 104a. htm.
10Marcus, Claudio. A Practical Yet Meaningful Approach to Customer Segmentation [J] . Journal of Consumer Marketing, 1998, Vol. 15 Issue 5:494- 504.