Calvin Johnson shows early retirement for NFL players is no longer an anomaly, NFL
Understanding Lions WR Calvin Johnson's quiet retirement - Sports Illustrated
Calvin Johnson's retirement statement: 'At peace' with decision
Calvin Johnson: Bigger, Stronger, Faster and, Maybe Soon, Retired - The New York Times
Cowboys opponent preview: How will the Lions fill the void left by the retirement of Calvin Johnson?
Calvin Johnson retires: 'I have played my last game of football' - ABC7 San Francisco
Why Calvin Johnson may have not retired if Lions traded him like Stafford
Calvin Johnson retiring: Here's why the star wants to retire so young
Lions, NFL players reacts to news of Calvin Johnson's potential retirement - Pride Of Detroit
NFL notes: Calvin Johnson tells Lions he's retiring, report says - The Boston Globe
Fantasy impact of Calvin Johnson's retirement, PFF News & Analysis
Calvin Johnson's reaction to his teammates missed layup in a celebrity
Detroit Lions' Calvin Johnson joins this list of star athletes, including Barry Sanders, who retired early - ESPN
Sports world reacts to Calvin Johnson's retirement