The document discusses how periods of little change can be followed by periods of rapid change. It then lists four sources that provide information on digital journalism: The Story So Far by Tow Center discusses what is known about the business of digital journalism; Mediactive and We the Media by Dan Gillmor discuss citizen and community media; Long Tail by Chris Anderson examines niche markets; and Tipping Point by Malcolm Gladwell looks at how small changes can produce large effects.