Mets to Retire Jerry Koosman's Jersey - The New York Times
Mets announce Jerry Koosman number retirement date –
Mets to Retire Jerry Koosman's Jersey - The New York Times
Mets to Retire Jerry Koosman's Jersey - The New York Times
Jerry Koosman: Playoff Ace for NY Mets - Mets History
Mets to Retire Jerry Koosman's Jersey - The New York Times
Jerry Koosman's No. 36 to Be Retired By Mets in June – NBC New York
Mets will retire Jerry Koosman's number in 2020 – New York Daily News
Jerry Koosman to Have Number Retired on August 28, 2021