Calvin Johnson reportedly follows Barry Sanders, retires - Bucs Nation
Herman Moore believes Calvin Johnson will retire - Pride Of Detroit
Calvin Johnson - Wikipedia
Calvin Johnson leaves a legacy in Detroit far beyond catches and yards - Vintage Detroit Collection
Calvin Johnson visits Lions OTAs, says he's a fan of Dan Campbell and staff
Calvin Johnson officially retires from NFL
Calvin Johnson brings an end to nine-year career with Detroit Lions, NFL News
Calvin Johnson gets painfully honest on why he left the NFL
Vikings React to Calvin Johnson's Retirement