Rob Gronkowski retires (again) from NFL, revisited: Why former Buccaneers, Patriots tight end called it a career
AP source: Gronk out for Sunday's game at New England
Tampa Bay Buccaneers Tight End Rob Gronkowski Announces Retires, 11 NFL Seasons and 4 Super Bowls
Patriots trade retired Rob Gronkowski to Buccaneers to reunite with Tom Brady - The Boston Globe
Tom Brady and Rob Gronkowski back on the same team? The tight end has a plan to make it happen
Rob Gronkowski: NFL return to Tampa Bay Buccaneers leaves one question
Tampa Bay Buccaneers TE Rob Gronkowski retiring from NFL for second time - ESPN
Gronkowski suffered serious injuries before Patriots-Buccaneers
New England Patriots Trade Tight End Rob Gronkowski to Tampa Bay Buccaneers