Lions' Bob Quinn: Calvin Johnson decision will alter free-agency plans - ESPN - NFL Nation- ESPN
Athletes who retired early
Calvin Johnson Officially Retires From the NFL, News
Calvin Johnson says players could get painkillers like candy
Calvin Johnson - Wikipedia
Former Lions WR Calvin Johnson: 'Things are going good right now' - ABC7 New York
Calvin Johnson elected to Pro Football Hall of Fame; Megatron played for Georgia Tech, Detroit Lions
Detroit Lions Star Wide Receiver Calvin Johnson Unexpectedly Retires
Report: Calvin Johnson told Caldwell he's retiring
Calvin Johnson reveals the scary truth behind NFL injuries