Chiefs' Husain Abdullah retires after sustaining five concussions - Sports Illustrated
Husain Abdullah announces retirement on Instagram with health as top reason - ESPN
We Shouldn't Be Surprised When NFL Players Retire Early Anymore
Ex NFL Kansas City Chiefs' Husain Abdullah quits after suffering FIVE concussions
Who is Husain Abdullah? Chief's players penalized for end-zone prayer - ABC7 San Francisco
22 NFL players who retired early, from Gronk to Barry Sanders
The NFL Can't Seem to Make Up Its Mind About CTE
Penalty on player who dropped to knees in prayer ignites controversy
NFL players should consider the same thoughts Husain Abdullah had before he retired