Sunday Morning Quarterback: Brett Favre's memory loss puts a high-profile face on NFL's concussion problem – New York Daily News
Brett Favre: God Only Knows The Toll From NFL Concussions
Brett Favre has memory issues, may have had 'thousands' of concussions
Former Quarterback Brett Favre Admits Memory Loss
NFL Concussions: The 2013-14 Season In Review
10 Things NFL Fans Forget About Brett Favre
Brett Favre looks back on time with Green Bay Packers, more - Sports Illustrated
End of an era: A look back at Brett Favre's career
Brett Favre, Tony Dungy elected to Hall of Fame – Twin Cities
NFL Legend Brett Favre Says He's Likely Had 'Thousands' of Concussions
Favre Reveals Football Has Taken Toll On His Memory - CBS Pittsburgh
Brett Favre Believes He's Suffered “Thousands” of Concussions