Ultimate Mets Database - Jerry Koosman
Mets retiring No. 36 of ex-pitcher Koosman in '20 - ESPN
Jerry Koosman number retirement set for June 13 - Amazin' Avenue
Jerry Koosman's No. 36 to Be Retired By Mets in June – NBC New York
Jerry Koosman's Mets number retirement is finally here
Retired Number Is Latest Mets Head-Scratcher
Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online
New York Mets: Jerry Koosman to Have His Number Retired
Mets retire Jerry Koosman's No. 36 in Citi Field ceremony
Mets announce Jerry Koosman number retirement date