1. McGrath, R.G and MacMillan, I., The Entrepreneurial Mindset (Harvard Business School Press, 2000).
2. Rossi, M., Decoding the ‘Free/Open Source Software Puzzle’: a survey of theoretical and empirical contributions (2004), in: The Economics of Open Source Software Development, edited by J. Bitzer and P.J.H. Schröder (Elsevier 2005); http://opensource.mit.edu/papers/rossi.pdf.
3. Raymond, E., The Cathedral & the Bazaar (O’Reilly, February 2001). See also http://www.catb.org/~esr/writings/cathedral-bazaar/.
4. Bessen, J.E., Open Source Software: Free Provision of Complex Public Goods (July 2005). Available at SSRN: http://ssrn.com/abstract=588763 or DOI: 10.2139/ssrn.588763 (http://dx.doi.org/10.2139/ssrn.588763).
5. vTiger CRM; http://www.vtiger.com/.