Pay what you want
参考文献
- Strom, Stephanie; Gay, Malcolm. . New York Times. May 20, 2010 [2010-05-21]. (原始内容存档于2010-05-24).
- Smart Pricing, Chapter 1. "Pay As You Wish" Pricing, Raju and Zhang, Wharton School Publishing, 2010. ISBN 0-13-149418-X.
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