Most Influential Book (3 min) TV-14 Play video Select your TV provider to log in to have full access to videos Select your TV provider See all providers Don't see your TV provider? Learn more You can access this video on the free HISTORY® iPad and iPhone app. Don't have the HISTORY® app? Your Parental Control settings do not allow you to view this content. Most Influential Book (3 min) TV-14 Historians and experts weigh in on what they think is the most influential book ever written.