Calvin Johnson on concussions, injuries - Sports Illustrated
Calvin Johnson Not Interested In Return To NFL
Calvin Johnson: MEGATRON NFL Legends Highlights
Bacon: Calvin Johnson probably going to retire; Red Wings borderline wild card team
A Football Life': Hall of Fame wide receiver Calvin Johnson explains why he retired after the 2015 NFL season
Calvin Johnson: Playing football 'wasn't fun any more'
NFL notes: Calvin Johnson tells Lions he's retiring, report says - The Boston Globe
Calvin Johnson Might Retire. I'm Scared.
Lions star receiver Calvin Johnson retires after nine seasons - The Globe and Mail
Calvin Johnson Speaks About His Retirement, Legacy
I have played my last game of football': Detroit Lions' Calvin Johnson at peace as he retires
Lions' Calvin Johnson makes 'difficult decision' to retire
Calvin Johnson, Quiet and Classy, Retires the Way He Played - The New York Times