Operation Bullpen: Be aware of these authenticators and autograph

Forgery: The bane of the hobby of sports collectors - Sports

Operation Bullpen Author Shares Some of the Tricks of the Trade of

Baseball's Army of Authenticators - WSJ

Fraud is 'rampant' in sports collectibles. Here's how the industry

Operation Bullpen: Be aware of these authenticators and autograph sellers - Sports Collectors Digest

A Picture's Worth 1,000 Wordsand $11,000 : The Price of a Babe Ruth

Fake autographs a multi-million dollar problem for collectors

Operation Bullpen: Unraveling the Sports Memorabilia Forgery Ring

MLB authenticators find value in baseball's mundane moments

Book Operation Bullpen Inside Story Biggest Forgery Scam Nelson

How to tell if your Mickey Mantle autograph is real, fake or Operation Bullpen special.

Book Operation Bullpen Inside Story Biggest Forgery Scam Nelson