July 23, 2009: Mark Buehrle's perfect day

Great Catches and Great Games Are Forever Linked - The New York Times

Perfection: Sox' Mark Buehrle pitches perfect game – Trentonian

Hochevar pitches three-hit shutout of White Sox

White Sox's Humber throws perfect game against M's

Buehrle roughed up in Twins' victory over White Sox

Here's the last 10 perfect games in MLB history. : r/mlb

Today in Chicago White Sox History: July 23 - InsideTheWhite Sox on Sports Illustrated: News, Analysis, and More

Mark Buehrle throws PERFECT GAME! (Great defense and unforgettable pitching leads to memorable day)

July 23, 2009: Mark Buehrle's perfect day – Sun Sentinel

Buehrle throws 18th perfect game in MLB history

Remembering Mark Buehrle's perfect game

Philip Humber of the Chicago White Sox throws a perfect game against the Seattle Mariners – New York Daily News

July 23, 2009: Mark Buehrle's perfect day – Sun Sentinel

Oral history of Mark Buehrle's perfect game