The e-book market has continued to grow while sales of paper books have declined, and the suit the United States Department of Justice brought against five of the six biggest corporate publishers in America — Random House was excluded — will advance that trend. (huffingtonpost.com)
The effects of ebooks on sales of paper books have not been as drastic as expected — it seems that other, more unpredictable factors have a greater influence on how and what we read (theguardian.com)
If you dig a little deeper, you will see that the increase in revenue is due to the acquisition of Harlequin, not due to increased sales of paper books. (goodereader.com)