Mets retire Willie Mays' No. 24 as Old-Timers' Day returns
Jerry Koosman's No. 36 retired by Mets
Mets will retire Jerry Koosman's number in 2020 – New York Daily News
Jerry Koosman to Have Number Retired on August 28, 2021
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns - NBC
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns
Mets retire Jerry Koosman's No. 36 in Citi Field ceremony
Jerry Koosman's Mets number retirement is finally here
Steven Matz: On Why He Can Be The Met's Next Jerry Koosman
The Miracle Has Landed: The Amazin' Story of How the