Why do errors count against a perfect game if they're not the pitcher's fault? - Quora
Here's the last 10 perfect games in MLB history. : r/mlb
Roy Halladay's perfect game - Wikipedia
Roy Halladay Perfect Game: Throws 2nd No-Hitter In MLB Playoff History, News, Scores, Highlights, Stats, and Rumors
Where does Roy Halladay's perfect game rank among all-time regular season Phillies games? - The Good Phight
60 Moments: No. 7, Armando Galarraga's imperfect game - The Athletic
Rest peacefully, Roy Halladay. - Complete Hockey News
Evan Longoria - Wikipedia
Remembering Roy Halladay's perfect game and playoff-no hitter