Mets retire Jerry Koosman's No. 36 in Citi Field ceremony
Mets will retire Jerry Koosman's number in 2020 – New York Daily News
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns - NBC
Jerry Koosman's number retirement, 08/28/2021
Mets set to pay tribute to Jerry Koosman - Newsday
Mets to retire 1969 World Series hero Koosman's number in August
New York Mets - We will retire Jerry Koosman's number 36 in 2020
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns
Mets retiring Dwight Gooden's No. 16 and Darryl Strawberry's No
Mets to retire Jerry Koosman's No. 36 in June - Newsday
Mets announce Jerry Koosman number retirement date –
Mets to retire numbers for Doc Gooden and Darryl Strawberry – NBC