'On to the next chapter': Former Cleveland Browns center JC Tretter announces retirement
J.C. Tretter: Breaking News, Rumors & Highlights
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
Is Acquiring JC Tretter Realistic for the Vikings? - Daily Norseman
Former Packers, Browns lineman JC Tretter announces NFL retirement
Akron HS grad JC Tretter retires after 8-year NFL career
JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ESPN
It May Be Now or Never for J.C. Tretter and The Vikings
NFLPA president JC Tretter rips into the condition of Soldier Field and claims NFL must 'do better'