The link between head injuries and CTE in football, explained - Vox

The NFL won't win the concussion narrative - Cincy Jungle

The NFL and Concussions: The Overlooked Obvious - Bolts From The Blue

Lawrence Jackson's post-NFL story reveals mental toll of football - Pride Of Detroit

What is C.T.E.? - The New York Times

US health body officially acknowledges link between collision sports and CTE in historic ruling

Neurological consequences of traumatic brain injuries in sports - ScienceDirect

Study links youth football to greater risk of later health problems - The Boston Globe

Concussion in football: Link between sporting head impacts and CTE 'reasonable to consider', says report, Football News

Olin Kreutz: Football's Ultimate Defender - Windy City Gridiron

The link between head injuries and CTE in football, explained - Vox

University of Wisconsin football players downplay warnings while proof of brain injury — even from small hits — piles up - Wisconsin Watch