Why Rob Gronkowski says he 'isn't really retiring,' plus what he'd say if Tom Brady called - ABC News
Former Patriots TE says which NFL coach could bring him out of retirement
Tampa Bay Buccaneers TE Rob Gronkowski retiring from NFL for second time - ESPN
Patriots Suffer Big Loss: Gronkowski Will Retire - The New York Times
4-time champion, All-Pro tight end Rob Gronkowski announces retirement
Rob Gronkowski announces retirement, can Tom Brady convince Gronk to return?, UNDISPUTED
Internet reacts to Rob Gronkowski's retirement announcement - ESPN
Rob Gronkowski retires (again) from NFL, revisited: Why former Buccaneers, Patriots tight end called it a career
Patriots' Rob Gronkowski announces his retirement following nine NFL seasons - Los Angeles Times
Rob Gronkowski retires, won't join Tom Brady for 3rd season