September 26, 1981: Nolan Ryan breaks Koufax's mark with fifth no-hitter – Society for American Baseball Research
Astros' Justin Verlander throws another no-hitter - The Boston Globe
Astros throw second World Series no-hitter, tie the series at 2 games apiece : NPR
Combined no-hitters not as special, even in World Series - Sports Illustrated
A look at 14 no-hitters in Houston Astros' history
Astros' Framber Valdez Throws No-Hitter Against Guardians - The New York Times
Javier, Astros pitch 2nd no-hitter in World Series history - NBC Sports
Verlander pitches 3rd career no-hitter, Astros beat Jays 2-0
When Astros Made History With No-Hitter Against Yankees - The New York Times