Rob Gronkowski trade: Patriots send tight end to Buccaneers, reunites with Tom Brady - The Phinsider
Former Patriots TE Rob Gronkowski announces retirement for 2nd time
Bucs' Rob Gronkowski retires, leaves door open for NFL return
Rob Gronkowski of New England Patriots Retires From Football - Bloomberg
Why did Gronk retire? Timeline of NFL retirement, comeback - Sports Illustrated
Rob Gronkowski retires (again) from NFL: Why we hope this one doesn't stick either
New England Patriots tight end Rob Gronkowski announces retirement, New England Patriots
All-Pro tight end Rob Gronkowski retires again - The Japan Times
Rob Gronkowski Retiring From Tampa Bay Bucs, NFL For 2nd Time
Tampa Bay Buccaneers TE Rob Gronkowski retiring from NFL for second time - ESPN
Rob Gronkowski retires: Bucs TE to end his Hall of Fame NFL career