Jerry Koosman number retirement set for June 13 - Amazin' Avenue
Ed Kranepool must be next Mets number retired after Jerry Koosman
Mets to retire Koosman's number — Queens Daily Eagle
NY Mets honor legend Jerry Koosman by retiring No. 36 jersey
Mets News: Mets to retire Jerry Koosman's number 36 in 2020
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
New York Mets: Jerry Koosman to Have His Number Retired
Jerry Koosman's No. 36 to Be Retired By Mets in June – NBC New York
Mets to Retire Jerry Koosman's Jersey - The New York Times
Jerry Koosman: Playoff Ace for NY Mets - Mets History