Engage!, Revised and Updated: The Complete Guide for Brands ...
Brian Solis
Shar VanBoskirk, “Interactive Marketing Nears $55 Billion; Advertising Overall Declines,” Forrester Research (July 7, 2009), http:// blogs.forrester.com/marketing /2009/07/interactive-marketing-nears-55 -billion-advertising-overall-declines.html .