Andrew Luck's retirement stuns former coaches: 'It's a blow to football'
Andrew Luck shares regret of retirement announcement to ESPN
Andrew Luck retirement was a rational choice - The Washington Post
Colts quarterback Andrew Luck announces he is retiring from football - Los Angeles Times
Coach: Andrew Luck is a dad again, headed back to school
Andrew Luck retirement: Here's hoping he finds peace and fulfillment in whatever is next to come
Why did Andrew Luck quit: Colts QB shocks his coach, GM, owner, city.
NFL: Andrew Luck returns to familiar football territory
Colts QB Andrew Luck announces his retirement - The Boston Globe
Andrew Luck isn't coming back to the Indianapolis Colts
NFL: Colts quarterback Andrew Luck announces retirement, leaving Jacoby Brissett as Indianapolis starter
In Andrew Luck's Retirement, Football's Consequences Weigh Heavily - The New York Times
Andrew Luck's Retirement At 29 Should Be A Warning To The NFL