Former Cubs pitcher Jon Lester, part of team's World Series core, announces his retirement - Chicago Sun-Times
Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN
Articles by Gene Farris's Profile, Chicago Sun-Times Journalist
Jon Lester's legacy will be felt in Cubs' clubhouse for a long time - Chicago Sun-Times
Former Cubs pitcher Jon Lester, part of team's World Series core, announces his retirement - Chicago Sun-Times
3-Time World Series Champion Announces Retirement - The Spun: What's Trending In The Sports World Today
Jon Lester, former Cubs ace and World Series champ, retires from MLB – NBC Sports Chicago
Chicago Cubs - Wikipedia
Jon Lester retires
Jon Lester was an amazing person to have on the Chicago Cubs
Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN
Former Cubs pitcher Jon Lester, part of team's World Series core, announces his retirement - Chicago Sun-Times
Cubs' Jon Lester goes for 13th straight 30-start season - Chicago Sun-Times
Jon Lester: Ex-Chicago Cubs pitcher signs with Washington Nationals