Piazza reflects on 9/11 and 9/21 home run - Newsday
Mike Piazza looks back on post-9/11 home run
September 11 attacks - Wikipedia
9/11 Reflections Renewed as 21st Anniversary Nears – NBC10
Newsday Long Island's & NYC's News Source - Newsday
Mike Piazza appreciates Pete Alonso keeping 9/11 traditions - Newsday
MLBN Presents: Piazza's Home Run After September 11th
Plaza Hotel - Wikipedia
World Trade Center (2001–present) - Wikipedia