All-Tom Brady Team: Rob Gronkowski, Richard Seymour among best to have played with QB
Rob Gronk Gronkowski Retires from NFL
Tom Brady retires after 22 seasons, 7 Super Bowl titles – The Denver Post
Former Patriots great Rob Gronkowski retires for a second time
Rob Gronkowski of New England Patriots Retires From Football - Bloomberg
New England Patriots Tight End Rob Gronkowski retires - The Phinsider
Tom Brady retires from NFL after winning seven super Bowl rings
Rob Gronkowski says the Patriots hold a special place in his heart
Why did Gronk retire? Timeline of NFL retirement, comeback - Sports Illustrated
Rob Gronkowski: 'I'm Not Really Retired'