1. Howe, J.: Crowdsourcing: Why the Power of the Crowd Is Driving the Future of Business. Crown Business (2008)
2. Surowiecki, J.: The Wisdom of Crowds. Random House, Inc. (2005)
3. Stol, K.-J., Fitzgerald, B.: Two’s company, three’s a crowd: a case study of crowdsourcing software development. In: 36th International Conference on Software Engineering (2014)
4. Chanal, V., Caron-Fasan, M.L.: The difficulties involved in developing business models open to innovation communities: the case of a crowdsourcing platform. Management 13, 4 (2010)
5. Topcoder websit.
http://www.Topcoder.com