Former Browns center, NFLPA president JC Tretter retires
2017 Cleveland Browns, American Football Wiki
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
JC Tretter Plans to Play Next Season, Leaving Browns With Decision to Make - Sports Illustrated Cleveland Browns News, Analysis and More
Browns starting center Tretter returns to practice after surgery
49ers news: CBS' Sports believes the 49ers should sign C J.C. Tretter before the season starts - Niners Nation
Former Browns Jarvis Landry, JC Tretter could have helped - Dawgs By Nature
J.C. Tretter wants to stay a Cleveland Brown - Sports Illustrated Cleveland Browns News, Analysis and More
JC Tretter announces retirement - BrownsZone with Scott Petrak
Former Browns center JC Tretter retiring after 8 NFL seasons, will stay on as NFLPA president