Rob Gronkowski Announces Retirement From NFL, Again - E! Online
Gronk Retires, But His Agent Leaves an Opening - Sports Illustrated
Rob Gronkowski says there is one NFL coach who can (maybe) get him out of retirement
Rob Gronkowski announces retirement from the NFL - Hernando Sun
Rob Gronkowski Retired. Again. - The New York Times
Rob Gronkowski Says He'd Retire If Forced To Decide Now
In year two out of retirement, Rob Gronkowski ready to go “full speed” - Bucs Nation
Who is Rob Gronkowski and why is he retiring?
Who is Rob Gronkowski and why is he retiring?