Rob Gronkowski Announces Retirement From The NFL – Hollywood Life
Rob Gronkowski announces retirement, can Tom Brady lure Gronk back to Bucs?, NFL
Patriots' Rob Gronkowski announces his retirement following nine NFL seasons - The San Diego Union-Tribune
A Key to Brady's Super Bowl Success? Gronkowski, of Course - The New York Times
Rob Gronkowski: Career retrospective
Rob Gronkowski Retires From NFL - ESPN 98.1 FM - 850 AM WRUF
Three-time Super Bowl champion Rob Gronkowski announces retirement from NFL after nine seasons
Buccaneers Tight End Rob Gronkowski Says He Will Retire, Again
Rob Gronkowski Announces Retirement, Tom Brady Tweets Funny Response – NBC 6 South Florida