http://clients1.ibisworld.com.remote.baruch.cuny.edu/reports/us/industry/industryoutlook.aspx?indid=1084

http://clients1.ibisworld.com.remote.baruch.cuny.edu/reports/us/industry/majorcompanies.aspx?indid=4579

http://m.ibtimes.com/borders-liquidation-bookstores-ereaders-182819.html

The first two sources contain mostly statistical research and analysis about the traditional book industry and the ebook publishing industry. They both, as you can imagine, seem to have an inverse relationship. Traditional bookstores are shrinking, switching to fill micro-niches, or going out of business entirety. On the other-hand the Ebook industry is thriving with the introduction of e-readers: kindles, iPads, nooks.