Rob Gronkowski Retired. Again. - The New York Times
Rob 'Gronk' Gronkowski announces retirement from Buccaneers, NFL on Instagram
Rob Gronkowski retiring from the NFL again
Internet reacts to Rob Gronkowski's retirement announcement - ESPN
Buccaneers Tight End Rob Gronkowski Says He Will Retire, Again
Rob Gronkowski On Retirement, Possible Return
4-time champion, All-Pro tight end Rob Gronkowski announces retirement
Rob Gronkowski Discussed Second Unretirement With Buccaneers
Rob Gronkowski won't rejoin NFL, will stay retired with Tom Brady
Rob Gronkowski retires from the NFL again - The Boston Globe
Rob Gronkowski announces retirement from NFL – Boston Herald
Rob Gronkowski announces his retirement
Rob Gronkowski Announces NFL Retirement After 9 Seasons with Patriots, News, Scores, Highlights, Stats, and Rumors