Ingram's Vital Source Expands e-Textbook Offering with Acquisition of VPG ... - San Francisco Chronicle (press rele... http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNHNwFDc3Gg7jpyj-iizA9tfMkAe3g&url=http://www.sfgate.com/cgi-bin/article.cgi?f%3D/g/a/2011/06/30/prweb8614905.DTL