Lions' star WR Calvin Johnson to retire - Bucs Report
20 famous athletes who retired earlier than expected
Calvin Johnson likely saying goodbye to game he's so great at - Sports Illustrated
'I have played my last game of football': Detroit Lions' Calvin Johnson at peace as he retires
Retired NFL players Calvin Johnson, Rob Sims want to treat CTE and pain with marijuana—and help from Harvard
The 10 best players of NFL on Bad Teams (Part 2)
Calvin Johnson: Career retrospective
Like almost everything he does, Calvin Johnson's camp is different - ESPN - Detroit Lions Blog- ESPN
Calvin Johnson Officially Retires
Calvin Johnson elected to Pro Football Hall of Fame; Megatron played for Georgia Tech, Detroit Lions