1. Ashoka (2004). Estela villareal. Retrieved October 21, 2019, from Ashoka | Everyone a Changemaker website: https://www.ashoka.org/en/fellow/estela-villareal.
2. Capitalizing on convergence;Austin;Stanford Social Innovation Review, (Winter),2007
3. Social and commercial entrepreneurship: Same, different, or both?;Austin;Entrepreneurship Theory and Practice,2006
4. Balan-Vnuk, E., & Balan, P. (2015). Business model innovation in nonprofit social enterprises. In G. Roos & A. O’Connor (Eds.), Integrating innovation (pp. 205–232). Retrieved from https://www.jstor.org/stable/10.20851/j.ctt1sq5xd5.12.
5. Building sustainable hybrid organizations: the case of commercial microfinance organizations;Battilana;Academy of Management Journal,2010