Best Mets Pitching Peformances: 1960s – Mark Simon
Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online
Ladies & Gentlemen: Your 2021 US Open Preview
Jerry Koosman interview
Mets to retire Koosman's number — Queens Daily Eagle
Mets set to pay tribute to Jerry Koosman - Newsday
Jerry Koosman Baseball Stats by Baseball Almanac
At least it's colorful
Jerry Koosman's number retirement, 08/28/2021
Mets retire Koosman's 36 five decades after '69 heroics