Calvin Johnson is set to announce his retirement : r/nfl
Calvin Johnson Explains Why He Retired After the 2015 Season
Detroit Lions' Calvin Johnson joins this list of star athletes, including Barry Sanders, who retired early - ESPN
Calvin Johnson says retirement would've been hard if Lions were contenders : r/detroitlions
Matthew Stafford says Detroit Lions 'tougher' to defend sans Megatron
Tate: I'm ready to be No. 1 if Calvin retires
Calvin Johnson pens letter to Lions fans: 'Michigan will forever be my home' - Pride Of Detroit
Calvin Johnson Opens Up In Interview About Tenure With Lions
Calvin Johnson says he would have played for any other team before retiring, but Lions wouldn't let him go
Former Lions WR Calvin Johnson on Jameson Williams: 'Anything I can do to help him, I'll do that'
Detroit Lions receiver Calvin 'Megatron' Johnson retires from the NFL at age 30 - Los Angeles Times
Calvin Johnson: 'No, I'm not coming back'