1. S. T. Brull, Net nightmare for the music biz, Business Week. Mar. 2, 1998.
2. Roll your own CDs, The Economist. Mar. 13, 1998.
3. FrankBlack and the Catholics, [2000]. Available: http://www.emusic.com/gcf63c02d292b7bc/artists/1/
4. Net sounds: Can the Web sell music? Sony is determined to find out, Wall Street Journal. Mar. 19, 1998.
5. Y. Bakos, and E. Brynjolfsson, Bundling information goods: Pricing, profits and efficiency,Management Science, vol. 95, no. 12, pp. 1613-1630, 1999.