Rob Gronkowski announces retirement from NFL for second time
Rob Gronkowski Announces His Retirement - Sports Illustrated
Patriots tight end Rob Gronkowski announces retirement
Buccaneers tight end Rob Gronkowski says he will retire, again - CBS News
Ex-Wildcat Rob Gronkowski announces retirement from NFL
Rob Gronkowski will try a field goal in live Super Bowl ad
Rob Gronkowski announces retirement, can Tom Brady convince Gronk to return?, UNDISPUTED
Patriots tight end Rob Gronkowski announces retirement
Patriots' Rob Gronkowski announces his retirement following nine NFL seasons - The San Diego Union-Tribune
Rob Gronkowski Intends To Retire
Four-time All-Pro TE Rob Gronkowski: 'I'm done with football'