MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe
It's come to this: our Red Sox as human billboards
John Hancock ending long-held Boston Red Sox sponsorship
Red Sox to sport MassMutual logo under new partnership - Boston Business Journal
Red Sox set the jersey sponsorship market with 10-year, $17mil annual deal with Mass Mutual : r/redsox
MLB's Red Sox land MassMutual as jersey patch sponsor - Sportcal
Red Sox Mass Mutual Collaboration – NBC Boston
MLB's new uniform rules won't prevent Red Sox from keeping Boston traditions – Boston Herald
News: CMO of the Week: MassMutual's Jennifer Halloran
Why MassMutual invested in a jersey sponsorship with the Red Sox
MLB Opening Day: Jersey Patches - Foul Or Fair Game?