Bill Walsh, Innovator of West Coast Offense, Dies at 75 - The New York Times
History of the Cleveland Browns - Wikipedia
NFL history: 100 people who shaped the league, pro football - Sports Illustrated
100 Things 49ers Fans Should Know & Do Before They Die (100 ThingsFans Should Know): Brown, Daniel, Craig, Roger: 9781600787911: : Books
Bill Walsh remembered as innovator
Dean Smith Was Pioneer in Use of Analytics - The New York Times
Notable deaths in 2007 – Sun Sentinel
America's Game: The Epic Story of How Pro Football Captured a Nation: MacCambridge, Michael: 9780375504549: : Books
What happened to the Bill Walsh offense? Is there a team that runs it as close to its purest form today? - Quora
Leadership Lessons of Bill Walsh: Discipline, Attention to Detail, and a Commitment to Continuous Improvement
Former 49ers head coach Bill Walsh's first book lives on as a Super Bowl road map - ESPN The Magazine - ESPN