Baseball history unpacked, June 17 - Bleed Cubbie Blue
Jon Lester retires
Jon Lester retires
Cubs - Gapers Block Tailgate
Cub Tracks' the gold watch and everything - Bleed Cubbie Blue
Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN
2015 Cubs Victories Revisited, October 7: Cubs 4, Pirates 0 - Bleed Cubbie Blue
Jon Lester - Wikipedia
Column: Why Chicago Cubs should retire Jon Lester's number
Jon Lester, former Cubs, Red Sox pitcher, announces retirement