Notes: Calvin Johnson updates relationship with Lions, offers thoughts on new regime - Pride Of Detroit
Calvin Johnson: Lions asked me to change my story about 2012 concussion - Sports Illustrated
Steelers Ike Taylor, Ryan Clark weigh in on Lions WR Calvin Johnson - Behind the Steel Curtain
Detroit Lions - Wikipedia
Former Detroit Lions receiver Calvin Johnson says he is content in retirement - ESPN
Calvin Johnson 'always wants to be there' for Detroit Lions players - Pride Of Detroit
Detroit Lions – Reaction to retirement of Calvin Johnson, a 'humble superstar' – The Oakland Press
Calvin Johnson tells Detroit Lions 2015/16 NFL season was his last, NFL News
Johnson pride of the Lions – Winnipeg Free Press