Detroit Lions' Calvin Johnson joins this list of star athletes, including Barry Sanders, who retired early - ESPN
The Life And Career Of Calvin Johnson (Story)
2021 NFL midseason report - What we've learned, questions and record projections for all 32 teams - ESPN
Calvin Johnson Jr., NFL Database Wiki
Matthew Stafford finally getting Super Bowl chance after decade with NFL's 'worst' team - Mirror Online
Calvin Johnson - Wikipedia
Lions' Calvin Johnson makes 'difficult decision' to retire
Calvin Johnson: Career retrospective
How Lions, Calvin Johnson are reconciling after long rift
Calvin Johnson sends clear message to Detroit Lions
19 Football Moments From Thanksgiving Day That Will Live On Forever
Calvin Johnson hints at lingering issues between him and Lions
Calvin Johnson: Career retrospective
Calvin Johnson leaves a legacy in Detroit far beyond catches and yards - Vintage Detroit Collection