1. Dalal, M.K., Zave, M.A.: Automatic text classification: a technical review. Int. J. Comput. Appl. (0975–8887) 28(2), 37–40 (2011)
2. Eirinaki, M., Pisal, S., Singh, J.: Feature-based opinion mining and ranking. J. Comput. Syst. Sci. 1175–1184 (2012)
3. Horrigan, J.A.: Online Shopping (2008)
http://www.pewinternet.org/2008/02/13/online-shopping/
4. http://nishithsblog.wordpress.com/2013/09/27/social-media-facts-and-statistics-for-2013/
5. http://www.academia.edu/6723240/Mining_Opinion_Features_in_Customer_Reviews