Former Browns center JC Tretter announces retirement from NFL
NFL Quarterback: How many teams have new quarterbacks this season?
JC Tretter retires after interest in playing for Vikings, other teams went unreciprocated - Sports Illustrated Minnesota Vikings News, Analysis and More
Calaméo - Buckeye Sports Bulletin June, 2014
NFL Quarterback: How many teams have new quarterbacks this season?
The Browns are releasing center JC Tretter
Browns center JC Tretter shoulders heavy responsibility of protecting players as president of NFL union
JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ESPN
JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ABC News