1. Anderson, C. (2010). The long tail: How endless choice is creating unlimited demand (p. 11). New York, NY: Random House.
2. Cairo, A. (2012). The functional art: An introduction to information graphics and visualization (p. 22). Berkeley, CA: New Riders.
3. Spotify Teardown
4. Making the Long Tail visible: social networking sites and independent music discovery
5. Governor, J., Nickull, D. & Hinchcliffe, D. (2009). Web 2.0 architectures: What entrepreneurs and information architects need to know (p. 62). Sebastopol, CA: O’Reilly Media.