Jon Lester retires: Former Red Sox, Cubs ace concludes 16-year career - Sports Illustrated
Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN
Jon Lester Retires After 16 MLB Seasons; Won 3 World Series with Red Sox and Cubs, News, Scores, Highlights, Stats, and Rumors
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Boston Red Sox: Breaking Down the Trade of Jon Lester to the Oakland Athletics, News, Scores, Highlights, Stats, and Rumors
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September 20, 2021: Jon Lester earns 200th and final career win – Society for American Baseball Research
Jon Lester retires after epic MLB career as Red Sox, Cubs ace - Sports Illustrated
With Jon Lester's retirement we ask: How do you define a Hall of Fame starting pitcher? - The Boston Globe