1. Doan, A., Ramakrishnan, R., Halevy, A.Y.: Crowdsourcing systems on the world-wide web. Commun. ACM 54(4), 86–96 (2011)
2. App Store:
http://www.apple.com/iphone/from-the-app-store/
(2014). Accessed on 18 Aug 2014
3. Northrop, L., Feiler, P., Gabriel, R.P., Goodenough, J., Linger, R., Longstaff, T., Kazman, R., Klein, M., Schmidt, D., Sullivan, K., et al.:
$$\{$$
{
Ultra-Large-Scale Systems
$$\}$$
}
-the software challenge of the future (2006)
4. Martin, R.C.: Agile Software Development: Principles, Patterns, and Practices. Prentice Hall PTR, Upper Saddle River (2003)
5. Herbsleb, J.D., Moitra, D.: Global software development. IEEE Softw. 18(2), 16–20 (2001)