The Denver Broncos did not fail Peyton Manning - Horse Tracks - Mile High Report
Peyton Manning's road to Denver: How prized free agent became Bronco - Sports Illustrated Vault
Peyton Manning Drops Hint at Retirement
The gold standard: Peyton Manning named a first-ballot Pro Football Hall of Famer
Denver Broncos: John Elway endorses Drew Lock at Combine
Peyton Manning Leads Denver to 6th Consecutive Win - The New York Times
John Elway talks Peyton Manning courtship, four-year run, retirement – The Denver Post
As career winds down, Peyton Manning takes it in and makes adjustments - Los Angeles Times
Super Bowl gives Peyton Manning one last chance to prove he's not a playoff loser – New York Daily News
Broncos' John Elway expects Peyton Manning back in 2014
Manning Makes It Official, Retires From Broncos, NFL