Calvin Johnson is a Hall of Fame wide receiver - Vintage Detroit Collection
Megatron retires at 30 — because he's smart
Megatron May Retire, But He Isn't Washed Up
Calvin Johnson lends advice to FAU receivers
Calvin Johnson tells Detroit Lions 2015/16 NFL season was his last, NFL News
NFL Notes: Report: Johnson told coach he will retire - Duluth News Tribune
Calvin Johnson expected to retire
Calvin Johnson retires: 'I have played my last game of football' - ABC7 Chicago
Calvin Johnson: Lions told him to change concussion story
Calvin Johnson - Simple English Wikipedia, the free encyclopedia
Calvin Johnson's Experience with the NFL and Traumatic Brain Injury